<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2024"
  xmlns:fmr="http://www.fidelity.com/20250929"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:oef="http://xbrl.sec.gov/oef/2024q3"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xhtml="http://www.w3.org/1999/xhtml"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="fmr-20250929.xsd" xlink:type="simple"/>
    <context id="Trust">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051090Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051110Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051070Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213722Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240063Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-RetailComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212302Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212305Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212299Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212307Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212309Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213720Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240060">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240060Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240060_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240060Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240060_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240060Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240060_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240060Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240060_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240060Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-K6-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-K6ComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212301Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212306Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212300Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212308Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000212310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213718Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240062">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240062Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240062_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240062Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240062_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240062Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240062_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240062Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240062_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240062Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-K-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-KComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051094">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051094Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051091Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051094Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051094Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051094Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNCMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018468Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051114">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051114Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051111Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051114Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051114Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051114Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNGMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018472Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051074">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051074Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051071Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051074Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051074Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000051074Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNIMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000018464Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055916">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055916Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055916Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055916Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055916Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNKMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055926">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055926Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055926Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055926Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000055926Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXZNLMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000019925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213723">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213723Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InflationProtectedDebtExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213721Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213723Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213723Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000213723Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXXRVMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000066139Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240064">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240064Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:AssetAllocationRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InvestingInOtherFundsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:StockMarketVolatilityMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ForeignExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IndustryExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CorrelationToIndexMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PassiveManagementRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:GrowthInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:ValueInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityLinkedInvestingMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:CommodityFuturesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritiesLendingRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:SecuritizedDebtSecuritiesExposureMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240065Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240064_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240064Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Cid_C000240064_ReturnBeforeTaxes_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000240064Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_IXUHT_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexIXUHTMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_SP001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexSP001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_AMRI-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000079155_Indexid_LB001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityManagedRetirementFunds-AIComboPROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000079155Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_InterestRateChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:InterestRateChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_PrepaymentMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:PrepaymentMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_IssuerSpecificChangesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:IssuerSpecificChangesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_LeverageRiskMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:LeverageRiskMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_HighPortfolioTurnoverMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">fmr:HighPortfolioTurnoverMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredDepositoryInstitutionMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_contentCd_MOG-PRO_RiskMember_RiskLoseMoneyMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2015">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-01-01</startDate>
            <endDate>2015-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2016">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2017">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-01-01</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2018">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-01-01</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2019">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-01-01</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2020">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-01-01</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2021">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2022">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-01-01</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2023">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-01-01</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_2024">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-01-01</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">fmr:C000019282Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB020Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB020Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB020Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_01">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_05">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <context id="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_10">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000751199</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:DocumentInformationDocumentAxis">fmr:FidelityGNMAFund-PROMember</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">fmr:S000007068Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">fmr:IndexLB001Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2015-09-29</startDate>
            <endDate>2025-09-29</endDate>
        </period>
    </context>
    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <unit id="holding">
        <measure>shares</measure>
    </unit>
    <dei:DocumentType contextRef="Trust" id="ixv-110599">485BPOS</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="Trust" id="ixv-110600">2025-09-29</dei:DocumentPeriodEndDate>
    <dei:AmendmentFlag contextRef="Trust" id="ixv-110601">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="Trust" id="ixv-110602">0000751199</dei:EntityCentralIndexKey>
    <dei:EntityInvCompanyType contextRef="Trust" id="ixv-110603">N-1A</dei:EntityInvCompanyType>
    <dei:EntityRegistrantName contextRef="Trust" id="ixv-110604">Fidelity Income Fund</dei:EntityRegistrantName>
    <oef:RiskReturnHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-313">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement Income Fund&#x2120; 
     /Fidelity Managed Retirement Income Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-326">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-331">
     
       
     Fidelity Managed Retirement Income Fund&#x2120; seeks high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-336">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-341">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-347">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-358">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018468_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122022"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-373">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="6"
      id="ixv-122023"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="6"
      id="ixv-122024"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="6"
      id="ixv-122025"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="6"
      id="ixv-122026"
      unitRef="pure">0.0045</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-420">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="0"
      id="ixv-122027"
      unitRef="usd">46</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="0"
      id="ixv-122028"
      unitRef="usd">144</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="0"
      id="ixv-122029"
      unitRef="usd">252</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018468_Cid_C000051090"
      decimals="0"
      id="ixv-122030"
      unitRef="usd">567</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-477">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-482">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       52 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018468_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122031"
      unitRef="pure">0.52</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-495">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-500">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      Allocating assets among underlying Fidelity&#xae; funds and futures according to a stable neutral asset allocation of approximately: 
      
      
       
        
         
           
         U.S. Equity Funds 11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds 20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-610">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-619">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-628">
     
       
      
      Stock Market Volatility. 
      
     Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-637">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-646">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-655">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-664">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-673">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-688">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-697">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-706">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-715">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-724">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-733">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-742">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-751">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-759">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-766">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-771">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-776"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-785"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-793"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-798">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2015"
      decimals="INF"
      id="ixv-122032"
      unitRef="pure">-0.0027</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2016"
      decimals="INF"
      id="ixv-122033"
      unitRef="pure">0.0523</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2017"
      decimals="INF"
      id="ixv-122034"
      unitRef="pure">0.0708</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2018"
      decimals="INF"
      id="ixv-122035"
      unitRef="pure">-0.0180</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2019"
      decimals="INF"
      id="ixv-122036"
      unitRef="pure">0.1057</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2020"
      decimals="INF"
      id="ixv-122037"
      unitRef="pure">0.0856</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2021"
      decimals="INF"
      id="ixv-122038"
      unitRef="pure">0.0276</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2022"
      decimals="INF"
      id="ixv-122039"
      unitRef="pure">-0.1167</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2023"
      decimals="INF"
      id="ixv-122040"
      unitRef="pure">0.0807</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_2024"
      decimals="INF"
      id="ixv-122041"
      unitRef="pure">0.0429</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-910">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122042"
      unitRef="pure">0.0646</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-920">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-925">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122043"
      unitRef="pure">-0.0613</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-936">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-941">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018468_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122044"
      unitRef="pure">0.0557</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-951">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-956">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-961">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-964"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-971"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000018468_contentCd_MRI-PRO" id="ixv-976"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_01"
      id="ixv-1021">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122045"
      unitRef="pure">0.0429</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122046"
      unitRef="pure">0.0212</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122047"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_01"
      id="ixv-1036">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122048"
      unitRef="pure">0.0312</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122049"
      unitRef="pure">0.0094</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122050"
      unitRef="pure">0.0188</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-1051">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122051"
      unitRef="pure">0.0263</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122052"
      unitRef="pure">0.0121</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051090_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122053"
      unitRef="pure">0.0199</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_01"
      id="ixv-1067">
         Fidelity Managed Retirement Income Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122054"
      unitRef="pure">0.0500</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122055"
      unitRef="pure">0.0256</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122056"
      unitRef="pure">0.0342</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-1092">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122057"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122058"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122059"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1218">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2010 Fund&#x2120; 
     /Fidelity Managed Retirement 2010 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1231">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1236">
     
       
     Fidelity Managed Retirement 2010 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1241">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1246">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1252">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1263">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018472_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122060"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1278">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="6"
      id="ixv-122061"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="6"
      id="ixv-122062"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="6"
      id="ixv-122063"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="6"
      id="ixv-122064"
      unitRef="pure">0.0045</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1325">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="0"
      id="ixv-122065"
      unitRef="usd">46</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="0"
      id="ixv-122066"
      unitRef="usd">144</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="0"
      id="ixv-122067"
      unitRef="usd">252</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018472_Cid_C000051110"
      decimals="0"
      id="ixv-122068"
      unitRef="usd">567</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1382">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1387">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018472_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122069"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1400">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1405">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-1567">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-1576">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-1585">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-1594">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-1603">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-1612">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-1621">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-1630">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-1645">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-1654">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-1663">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-1672">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-1681">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-1690">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-1699">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-1708">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-1716">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1723">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1728">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1733"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1742"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1750"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1755">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2015"
      decimals="INF"
      id="ixv-122070"
      unitRef="pure">-0.0013</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2016"
      decimals="INF"
      id="ixv-122071"
      unitRef="pure">0.0686</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2017"
      decimals="INF"
      id="ixv-122072"
      unitRef="pure">0.1062</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2018"
      decimals="INF"
      id="ixv-122073"
      unitRef="pure">-0.0284</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2019"
      decimals="INF"
      id="ixv-122074"
      unitRef="pure">0.1262</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2020"
      decimals="INF"
      id="ixv-122075"
      unitRef="pure">0.0958</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2021"
      decimals="INF"
      id="ixv-122076"
      unitRef="pure">0.0381</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2022"
      decimals="INF"
      id="ixv-122077"
      unitRef="pure">-0.1240</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2023"
      decimals="INF"
      id="ixv-122078"
      unitRef="pure">0.0852</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_2024"
      decimals="INF"
      id="ixv-122079"
      unitRef="pure">0.0448</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1867">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122080"
      unitRef="pure">0.0716</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1877">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1882">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122081"
      unitRef="pure">-0.0680</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1893">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1898">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018472_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122082"
      unitRef="pure">0.0558</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1908">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1913">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1918">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1921"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1928"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000018472_contentCd_MRI-PRO" id="ixv-1933"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_01"
      id="ixv-1978">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122083"
      unitRef="pure">0.0448</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122084"
      unitRef="pure">0.0248</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122085"
      unitRef="pure">0.0386</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_01"
      id="ixv-1993">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122086"
      unitRef="pure">0.0335</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122087"
      unitRef="pure">0.0113</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122088"
      unitRef="pure">0.0230</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-2008">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122089"
      unitRef="pure">0.0276</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122090"
      unitRef="pure">0.0149</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051110_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122091"
      unitRef="pure">0.0257</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_01"
      id="ixv-2024">
         Fidelity Managed Retirement 2010 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122092"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122093"
      unitRef="pure">0.0287</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122094"
      unitRef="pure">0.0420</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-2049">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122095"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122096"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122097"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2175">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2015 Fund&#x2120; 
     /Fidelity Managed Retirement 2015 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2188">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2193">
     
       
     Fidelity Managed Retirement 2015 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2198">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2203">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2209">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2220">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018464_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122098"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2235">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="6"
      id="ixv-122099"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="6"
      id="ixv-122100"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="6"
      id="ixv-122101"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="6"
      id="ixv-122102"
      unitRef="pure">0.0046</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2282">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="0"
      id="ixv-122103"
      unitRef="usd">47</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="0"
      id="ixv-122104"
      unitRef="usd">148</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="0"
      id="ixv-122105"
      unitRef="usd">258</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018464_Cid_C000051070"
      decimals="0"
      id="ixv-122106"
      unitRef="usd">579</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2339">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2344">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       40 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018464_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122107"
      unitRef="pure">0.40</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2357">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2362">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            15% 
         
         
           
         International Equity Funds  
            10% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 40% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 2% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            16% 
         
         
           
         Short-Term Funds 8% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-2526">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-2535">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-2544">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-2553">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-2562">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-2571">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-2580">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-2589">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-2604">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-2613">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-2622">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-2631">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-2640">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-2649">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-2658">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-2667">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-2675">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2682">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2687">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2692"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2701"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2709"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2714">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2015"
      decimals="INF"
      id="ixv-122108"
      unitRef="pure">-0.0006</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2016"
      decimals="INF"
      id="ixv-122109"
      unitRef="pure">0.0703</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2017"
      decimals="INF"
      id="ixv-122110"
      unitRef="pure">0.1206</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2018"
      decimals="INF"
      id="ixv-122111"
      unitRef="pure">-0.0369</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2019"
      decimals="INF"
      id="ixv-122112"
      unitRef="pure">0.1446</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2020"
      decimals="INF"
      id="ixv-122113"
      unitRef="pure">0.1087</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2021"
      decimals="INF"
      id="ixv-122114"
      unitRef="pure">0.0532</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2022"
      decimals="INF"
      id="ixv-122115"
      unitRef="pure">-0.1353</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2023"
      decimals="INF"
      id="ixv-122116"
      unitRef="pure">0.0963</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_2024"
      decimals="INF"
      id="ixv-122117"
      unitRef="pure">0.0517</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2826">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122118"
      unitRef="pure">0.0875</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2836">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2841">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122119"
      unitRef="pure">-0.0790</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2852">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2857">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018464_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122120"
      unitRef="pure">0.0611</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2867">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2872">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2877">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2880"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2887"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000018464_contentCd_MRI-PRO" id="ixv-2892"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_01"
      id="ixv-2937">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122121"
      unitRef="pure">0.0517</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122122"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122123"
      unitRef="pure">0.0440</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_01"
      id="ixv-2952">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122124"
      unitRef="pure">0.0407</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122125"
      unitRef="pure">0.0180</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122126"
      unitRef="pure">0.0271</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-2967">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122127"
      unitRef="pure">0.0318</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122128"
      unitRef="pure">0.0198</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051070_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122129"
      unitRef="pure">0.0298</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_01"
      id="ixv-2983">
         Fidelity Managed Retirement 2015 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122130"
      unitRef="pure">0.0587</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122131"
      unitRef="pure">0.0344</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122132"
      unitRef="pure">0.0474</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-3008">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122133"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122134"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122135"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3134">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2020 Fund&#x2120; 
     /Fidelity Managed Retirement 2020 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3147">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3152">
     
       
     Fidelity Managed Retirement 2020 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3157">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3162">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3168">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3179">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019923_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122136"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3194">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="6"
      id="ixv-122137"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="6"
      id="ixv-122138"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="6"
      id="ixv-122139"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="6"
      id="ixv-122140"
      unitRef="pure">0.0047</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3241">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="0"
      id="ixv-122141"
      unitRef="usd">48</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="0"
      id="ixv-122142"
      unitRef="usd">151</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="0"
      id="ixv-122143"
      unitRef="usd">263</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019923_Cid_C000055912"
      decimals="0"
      id="ixv-122144"
      unitRef="usd">591</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3298">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3303">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       39 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019923_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122145"
      unitRef="pure">0.39</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3316">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3321">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            19% 
         
         
           
         International Equity Funds 13% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            38% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 4% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            12% 
         
         
           
         Short-Term Funds 6% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-3485">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-3494">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-3503">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-3512">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-3521">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-3530">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-3539">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-3548">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-3563">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-3572">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-3581">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-3590">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-3599">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-3608">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-3617">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-3626">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-3634">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3641">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3646">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3651"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3660"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3668"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3673">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2015"
      decimals="INF"
      id="ixv-122146"
      unitRef="pure">0.0003</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2016"
      decimals="INF"
      id="ixv-122147"
      unitRef="pure">0.0707</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2017"
      decimals="INF"
      id="ixv-122148"
      unitRef="pure">0.1330</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2018"
      decimals="INF"
      id="ixv-122149"
      unitRef="pure">-0.0445</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2019"
      decimals="INF"
      id="ixv-122150"
      unitRef="pure">0.1619</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2020"
      decimals="INF"
      id="ixv-122151"
      unitRef="pure">0.1205</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2021"
      decimals="INF"
      id="ixv-122152"
      unitRef="pure">0.0677</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2022"
      decimals="INF"
      id="ixv-122153"
      unitRef="pure">-0.1463</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2023"
      decimals="INF"
      id="ixv-122154"
      unitRef="pure">0.1072</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_2024"
      decimals="INF"
      id="ixv-122155"
      unitRef="pure">0.0586</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3784">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122156"
      unitRef="pure">0.1024</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3794">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3799">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122157"
      unitRef="pure">-0.0982</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3810">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3815">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019923_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122158"
      unitRef="pure">0.0659</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3825">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3830">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3835">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3838"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3845"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000019923_contentCd_MRI-PRO" id="ixv-3850"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_01"
      id="ixv-3895">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122159"
      unitRef="pure">0.0586</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122160"
      unitRef="pure">0.0366</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122161"
      unitRef="pure">0.0489</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_01"
      id="ixv-3910">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122162"
      unitRef="pure">0.0483</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122163"
      unitRef="pure">0.0248</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122164"
      unitRef="pure">0.0323</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-3925">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122165"
      unitRef="pure">0.0360</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122166"
      unitRef="pure">0.0245</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055912_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122167"
      unitRef="pure">0.0338</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_01"
      id="ixv-3941">
         Fidelity Managed Retirement 2020 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122168"
      unitRef="pure">0.0655</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122169"
      unitRef="pure">0.0398</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122170"
      unitRef="pure">0.0523</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-3966">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122171"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122172"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122173"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4092">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2025 Fund&#x2120; 
     /Fidelity Managed Retirement 2025 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4105">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4110">
     
       
     Fidelity Managed Retirement 2025 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4115">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4120">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4126">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4137">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019925_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122174"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4152">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="6"
      id="ixv-122175"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="6"
      id="ixv-122176"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="6"
      id="ixv-122177"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="6"
      id="ixv-122178"
      unitRef="pure">0.0047</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4199">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="0"
      id="ixv-122179"
      unitRef="usd">48</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="0"
      id="ixv-122180"
      unitRef="usd">151</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="0"
      id="ixv-122181"
      unitRef="usd">263</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019925_Cid_C000055922"
      decimals="0"
      id="ixv-122182"
      unitRef="usd">591</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4256">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4261">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       45 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019925_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122183"
      unitRef="pure">0.45</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4274">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4279">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            23% 
         
         
           
         International Equity Funds  
            15% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 35% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 6% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            8% 
         
         
           
         Short-Term Funds 4% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-4443">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-4452">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-4461">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-4470">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-4479">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-4488">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-4497">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-4506">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-4521">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-4530">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-4539">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-4548">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-4557">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-4566">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-4575">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-4584">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-4593">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-4602">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-4611">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-4619">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4626">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4631">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4636"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4645"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4653"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4658">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2015"
      decimals="INF"
      id="ixv-122184"
      unitRef="pure">0.0010</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2016"
      decimals="INF"
      id="ixv-122185"
      unitRef="pure">0.0713</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2017"
      decimals="INF"
      id="ixv-122186"
      unitRef="pure">0.1424</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2018"
      decimals="INF"
      id="ixv-122187"
      unitRef="pure">-0.0508</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2019"
      decimals="INF"
      id="ixv-122188"
      unitRef="pure">0.1752</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2020"
      decimals="INF"
      id="ixv-122189"
      unitRef="pure">0.1309</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2021"
      decimals="INF"
      id="ixv-122190"
      unitRef="pure">0.0799</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2022"
      decimals="INF"
      id="ixv-122191"
      unitRef="pure">-0.1567</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2023"
      decimals="INF"
      id="ixv-122192"
      unitRef="pure">0.1183</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_2024"
      decimals="INF"
      id="ixv-122193"
      unitRef="pure">0.0657</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4769">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122194"
      unitRef="pure">0.1143</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4779">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4784">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122195"
      unitRef="pure">-0.1125</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4795">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4800">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019925_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122196"
      unitRef="pure">0.0710</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4810">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4815">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4820">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4823"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4830"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000019925_contentCd_MRI-PRO" id="ixv-4835"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_01"
      id="ixv-4880">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122197"
      unitRef="pure">0.0657</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122198"
      unitRef="pure">0.0418</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122199"
      unitRef="pure">0.0531</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_01"
      id="ixv-4895">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122200"
      unitRef="pure">0.0562</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122201"
      unitRef="pure">0.0297</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122202"
      unitRef="pure">0.0361</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-4910">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122203"
      unitRef="pure">0.0405</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122204"
      unitRef="pure">0.0288</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055922_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122205"
      unitRef="pure">0.0371</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_01"
      id="ixv-4926">
         Fidelity Managed Retirement 2025 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122206"
      unitRef="pure">0.0724</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122207"
      unitRef="pure">0.0446</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122208"
      unitRef="pure">0.0564</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-4951">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122209"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122210"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-PRO_10"
      decimals="4"
      id="ixv-122211"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5077">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2030 Fund&#x2120; 
     /Fidelity Managed Retirement 2030 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5090">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5095">
     
       
     Fidelity Managed Retirement 2030 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5100">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5105">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5111">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5122">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000066139_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122212"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5137">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="6"
      id="ixv-122213"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="6"
      id="ixv-122214"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="6"
      id="ixv-122215"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="6"
      id="ixv-122216"
      unitRef="pure">0.0048</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5184">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="0"
      id="ixv-122217"
      unitRef="usd">49</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="0"
      id="ixv-122218"
      unitRef="usd">154</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="0"
      id="ixv-122219"
      unitRef="usd">269</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000066139_Cid_C000213722"
      decimals="0"
      id="ixv-122220"
      unitRef="usd">604</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5241">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5246">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000066139_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122221"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5259">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5264">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            26% 
         
         
           
         International Equity Funds 18% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            33% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 7% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            5% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-5428">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-5437">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-5446">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-5455">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-5464">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-5473">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-5482">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-5491">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-5506">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-5515">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-5524">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-5533">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-5542">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-5551">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-5560">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-5569">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-5578">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-5587">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-5598">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-5606">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5613">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5618">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5624"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5631"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5637"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5642">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_2020"
      decimals="INF"
      id="ixv-122222"
      unitRef="pure">0.1382</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_2021"
      decimals="INF"
      id="ixv-122223"
      unitRef="pure">0.0889</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_2022"
      decimals="INF"
      id="ixv-122224"
      unitRef="pure">-0.1628</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_2023"
      decimals="INF"
      id="ixv-122225"
      unitRef="pure">0.1251</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_2024"
      decimals="INF"
      id="ixv-122226"
      unitRef="pure">0.0720</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5737">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122227"
      unitRef="pure">0.1244</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5747">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5752">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122228"
      unitRef="pure">-0.1243</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5763">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5768">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000066139_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122229"
      unitRef="pure">0.0741</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5778">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5783">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5788">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5791"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5798"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000066139_contentCd_MRI-PRO" id="ixv-5803"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_01"
      id="ixv-5850">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122230"
      unitRef="pure">0.0720</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122231"
      unitRef="pure">0.0459</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000066139AAR_A_RBT_loc"
      unitRef="pure">0.0567</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_01"
      id="ixv-5866">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122233"
      unitRef="pure">0.0633</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122234"
      unitRef="pure">0.0347</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000066139AAR_A_ATD_loc"
      unitRef="pure">0.0452</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-5882">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122236"
      unitRef="pure">0.0447</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122237"
      unitRef="pure">0.0322</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213722_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000066139AAR_A_ATDS_loc"
      unitRef="pure">0.0407</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_01"
      id="ixv-5899">
         Fidelity Managed Retirement 2030 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122239"
      unitRef="pure">0.0779</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122240"
      unitRef="pure">0.0484</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122241"
      unitRef="pure">0.0574</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-5924">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122242"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_05"
      decimals="4"
      id="ixv-122243"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122244"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000066139_Cid_C000213722" id="ixv-5967">2019-08-16</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6062">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2035 Fund&#x2120; 
     /Fidelity Managed Retirement 2035 Fund&#x2120;  
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6075">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6080">
     
       
     Fidelity Managed Retirement 2035 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6085">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6090">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6096">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6107">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000079155_contentCd_MRI-PRO"
      decimals="0"
      id="ixv-122245"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6122">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="6"
      id="ixv-122246"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="6"
      id="ixv-122247"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="6"
      id="ixv-122248"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="6"
      id="ixv-122249"
      unitRef="pure">0.0048</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6169">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="0"
      id="ixv-122250"
      unitRef="usd">49</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="0"
      id="ixv-122251"
      unitRef="usd">154</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="0"
      id="ixv-122252"
      unitRef="usd">269</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000079155_Cid_C000240063"
      decimals="0"
      id="ixv-122253"
      unitRef="usd">604</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6226">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6231">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       54 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000079155_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122254"
      unitRef="pure">0.54</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6244">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6249">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            29% 
         
         
           
         International Equity Funds  
            19% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 30% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 8% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            2% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-6413">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-6422">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-6431">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-6440">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-6449">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-6458">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-6467">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-6476">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-6491">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-6500">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-6509">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-6518">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-6527">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-6536">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-6545">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-6554">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-6563">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-6574">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-6582">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6589">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6594">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
      
       
     The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6600"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6607"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6613"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6618">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_2023"
      decimals="INF"
      id="ixv-122255"
      unitRef="pure">0.1343</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_2024"
      decimals="INF"
      id="ixv-122256"
      unitRef="pure">0.0773</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6703">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122257"
      unitRef="pure">0.0908</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6713">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6718">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122258"
      unitRef="pure">-0.0379</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6729">2023-09-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6734">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000079155_contentCd_MRI-PRO"
      decimals="4"
      id="ixv-122259"
      unitRef="pure">0.0780</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6744">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6749">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6754">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6757"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6764"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6769"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240063_ReturnBeforeTaxes_01"
      id="ixv-6808">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122260"
      unitRef="pure">0.0773</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000079155AAR_A_RBT_loc"
      unitRef="pure">0.0931</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributions_01"
      id="ixv-6821">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122262"
      unitRef="pure">0.0676</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000079155AAR_A_ATD_loc"
      unitRef="pure">0.0833</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-6834">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122264"
      unitRef="pure">0.0491</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240063_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-PROS000079155AAR_A_ATDS_loc"
      unitRef="pure">0.0688</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-PRO_01"
      id="ixv-6848">
         Fidelity Managed Retirement 2035 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122266"
      unitRef="pure">0.0833</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122267"
      unitRef="pure">0.0959</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-PRO_01"
      id="ixv-6867">
         S&amp;P 500&#xae; Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122268"
      unitRef="pure">0.2502</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122269"
      unitRef="pure">0.2415</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-PRO_01"
      id="ixv-6886">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-PRO_01"
      decimals="4"
      id="ixv-122270"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122271"
      unitRef="pure">0.0209</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000079155_Cid_C000240063" id="ixv-6918">2022-12-15</oef:AnnualReturnInceptionDate>
    <oef:PerformanceTableMarketIndexChanged contextRef="Pid_S000079155_contentCd_MRI-PRO" id="ixv-6925">
     
       
     Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&amp;P 500 
       
     &#xae; 
       
     &#160; 
     Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies. 
       
     &#160; 
       
    
   </oef:PerformanceTableMarketIndexChanged>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14235">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement Income Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14250">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14255">
     
       
     Fidelity Managed Retirement Income Fund&#x2120; seeks high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14260">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14265">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14271">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14282">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122272"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14297">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="6"
      id="ixv-122273"
      unitRef="pure">0.0025</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="6"
      id="ixv-122274"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="6"
      id="ixv-122275"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="6"
      id="ixv-122276"
      unitRef="pure">0.0025</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14344">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="0"
      id="ixv-122277"
      unitRef="usd">26</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="0"
      id="ixv-122278"
      unitRef="usd">80</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="0"
      id="ixv-122279"
      unitRef="usd">141</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018468_Cid_C000212302"
      decimals="0"
      id="ixv-122280"
      unitRef="usd">318</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14401">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14406">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       52 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122281"
      unitRef="pure">0.52</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14419">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14424">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      Allocating assets among underlying Fidelity&#xae; funds and futures according to a stable neutral asset allocation of approximately: 
      
      
       
        
         
           
         U.S. Equity Funds 11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds 20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-14534">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-14543">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-14552">
     
       
      
      Stock Market Volatility. 
      
     Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-14561">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-14570">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-14579">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-14588">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-14597">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-14612">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-14621">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-14630">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-14639">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-14648">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-14657">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-14666">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-14677">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-14685">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14692">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14697">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14703"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14710"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14716"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14721">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_2020"
      decimals="INF"
      id="ixv-122282"
      unitRef="pure">0.0879</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_2021"
      decimals="INF"
      id="ixv-122283"
      unitRef="pure">0.0297</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_2022"
      decimals="INF"
      id="ixv-122284"
      unitRef="pure">-0.1149</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_2023"
      decimals="INF"
      id="ixv-122285"
      unitRef="pure">0.0827</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_2024"
      decimals="INF"
      id="ixv-122286"
      unitRef="pure">0.0450</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14816">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122287"
      unitRef="pure">0.0652</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14826">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14831">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122288"
      unitRef="pure">-0.0608</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14842">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14847">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122289"
      unitRef="pure">0.0567</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14857">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_MRI-K6-PRO"
      id="ixv-14862">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_01"
      id="ixv-14896">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122290"
      unitRef="pure">0.0450</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122291"
      unitRef="pure">0.0233</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212302_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000018468AAR_A_RBT_loc"
      unitRef="pure">0.0274</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_01"
      id="ixv-14911">
         Fidelity Managed Retirement Income Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122293"
      unitRef="pure">0.0500</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122294"
      unitRef="pure">0.0256</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122295"
      unitRef="pure">0.0289</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-14936">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122296"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122297"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122298"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018468_Cid_C000212302" id="ixv-14979">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15076">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2010 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15091">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15096">
     
       
     Fidelity Managed Retirement 2010 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15101">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15106">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15112">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15123">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122299"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15138">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="6"
      id="ixv-122300"
      unitRef="pure">0.0025</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="6"
      id="ixv-122301"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="6"
      id="ixv-122302"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="6"
      id="ixv-122303"
      unitRef="pure">0.0025</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15185">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="0"
      id="ixv-122304"
      unitRef="usd">26</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="0"
      id="ixv-122305"
      unitRef="usd">80</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="0"
      id="ixv-122306"
      unitRef="usd">141</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018472_Cid_C000212305"
      decimals="0"
      id="ixv-122307"
      unitRef="usd">318</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15242">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15247">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122308"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15260">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15265">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-15427">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-15436">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-15445">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-15454">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-15463">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-15472">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-15481">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-15490">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-15505">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-15514">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-15523">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-15532">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-15541">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-15550">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-15559">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-15570">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-15578">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15585">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15590">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15596"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15603"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15609"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15614">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_2020"
      decimals="INF"
      id="ixv-122309"
      unitRef="pure">0.0980</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_2021"
      decimals="INF"
      id="ixv-122310"
      unitRef="pure">0.0403</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_2022"
      decimals="INF"
      id="ixv-122311"
      unitRef="pure">-0.1223</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_2023"
      decimals="INF"
      id="ixv-122312"
      unitRef="pure">0.0875</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_2024"
      decimals="INF"
      id="ixv-122313"
      unitRef="pure">0.0468</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15709">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122314"
      unitRef="pure">0.0723</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15719">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15724">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122315"
      unitRef="pure">-0.0676</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15735">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15740">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122316"
      unitRef="pure">0.0570</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15750">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_MRI-K6-PRO"
      id="ixv-15755">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_01"
      id="ixv-15789">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122317"
      unitRef="pure">0.0468</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122318"
      unitRef="pure">0.0268</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212305_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000018472AAR_A_RBT_loc"
      unitRef="pure">0.0321</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_01"
      id="ixv-15804">
         Fidelity Managed Retirement 2010 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122320"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122321"
      unitRef="pure">0.0287</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122322"
      unitRef="pure">0.0331</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-15829">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122323"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122324"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122325"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018472_Cid_C000212305" id="ixv-15872">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-15969">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2015 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-15984">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-15989">
     
       
     Fidelity Managed Retirement 2015 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-15994">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-15999">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16005">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16016">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122326"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16031">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="6"
      id="ixv-122327"
      unitRef="pure">0.0026</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="6"
      id="ixv-122328"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="6"
      id="ixv-122329"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="6"
      id="ixv-122330"
      unitRef="pure">0.0026</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16078">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="0"
      id="ixv-122331"
      unitRef="usd">27</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="0"
      id="ixv-122332"
      unitRef="usd">84</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="0"
      id="ixv-122333"
      unitRef="usd">146</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018464_Cid_C000212299"
      decimals="0"
      id="ixv-122334"
      unitRef="usd">331</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16135">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16140">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       40 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122335"
      unitRef="pure">0.40</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16153">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16158">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            15% 
         
         
           
         International Equity Funds  
            10% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 40% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 2% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            16% 
         
         
           
         Short-Term Funds 8% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-16322">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-16331">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-16340">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-16349">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-16358">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-16367">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-16376">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-16385">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-16400">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-16409">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-16418">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-16427">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-16436">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-16445">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-16454">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-16465">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-16473">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16480">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16485">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16491"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16498"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16504"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16509">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_2020"
      decimals="INF"
      id="ixv-122336"
      unitRef="pure">0.1111</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_2021"
      decimals="INF"
      id="ixv-122337"
      unitRef="pure">0.0552</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_2022"
      decimals="INF"
      id="ixv-122338"
      unitRef="pure">-0.1334</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_2023"
      decimals="INF"
      id="ixv-122339"
      unitRef="pure">0.0984</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_2024"
      decimals="INF"
      id="ixv-122340"
      unitRef="pure">0.0539</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16604">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122341"
      unitRef="pure">0.0880</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16614">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16619">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122342"
      unitRef="pure">-0.0784</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16630">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16635">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122343"
      unitRef="pure">0.0621</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16645">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_MRI-K6-PRO"
      id="ixv-16650">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_01"
      id="ixv-16684">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122344"
      unitRef="pure">0.0539</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122345"
      unitRef="pure">0.0330</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212299_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000018464AAR_A_RBT_loc"
      unitRef="pure">0.0393</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_01"
      id="ixv-16699">
         Fidelity Managed Retirement 2015 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122347"
      unitRef="pure">0.0587</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122348"
      unitRef="pure">0.0344</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122349"
      unitRef="pure">0.0396</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-16724">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122350"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122351"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122352"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018464_Cid_C000212299" id="ixv-16767">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16864">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2020 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16879">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16884">
     
       
     Fidelity Managed Retirement 2020 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16889">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16894">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16900">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16911">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122353"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16926">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="6"
      id="ixv-122354"
      unitRef="pure">0.0027</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="6"
      id="ixv-122355"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="6"
      id="ixv-122356"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="6"
      id="ixv-122357"
      unitRef="pure">0.0027</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-16973">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="0"
      id="ixv-122358"
      unitRef="usd">28</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="0"
      id="ixv-122359"
      unitRef="usd">87</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="0"
      id="ixv-122360"
      unitRef="usd">152</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019923_Cid_C000212307"
      decimals="0"
      id="ixv-122361"
      unitRef="usd">343</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17030">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17035">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       39 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122362"
      unitRef="pure">0.39</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17048">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17053">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            19% 
         
         
           
         International Equity Funds 13% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            38% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 4% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            12% 
         
         
           
         Short-Term Funds 6% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-17217">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-17226">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-17235">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-17244">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-17253">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-17262">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-17271">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-17280">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-17295">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-17304">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-17313">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-17322">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-17331">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-17340">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-17349">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-17360">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-17368">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17375">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17380">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17386"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17393"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17399"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17404">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_2020"
      decimals="INF"
      id="ixv-122363"
      unitRef="pure">0.1230</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_2021"
      decimals="INF"
      id="ixv-122364"
      unitRef="pure">0.0697</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_2022"
      decimals="INF"
      id="ixv-122365"
      unitRef="pure">-0.1447</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_2023"
      decimals="INF"
      id="ixv-122366"
      unitRef="pure">0.1094</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_2024"
      decimals="INF"
      id="ixv-122367"
      unitRef="pure">0.0607</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17499">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122368"
      unitRef="pure">0.1031</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17509">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17514">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122369"
      unitRef="pure">-0.0977</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17525">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17530">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122370"
      unitRef="pure">0.0672</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17540">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_MRI-K6-PRO"
      id="ixv-17545">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_01"
      id="ixv-17579">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122371"
      unitRef="pure">0.0607</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122372"
      unitRef="pure">0.0387</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212307_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000019923AAR_A_RBT_loc"
      unitRef="pure">0.0460</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_01"
      id="ixv-17594">
         Fidelity Managed Retirement 2020 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122374"
      unitRef="pure">0.0655</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122375"
      unitRef="pure">0.0398</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122376"
      unitRef="pure">0.0459</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-17619">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122377"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122378"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122379"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000019923_Cid_C000212307" id="ixv-17662">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17759">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2025 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17774">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17779">
     
       
     Fidelity Managed Retirement 2025 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17784">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17789">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17795">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17806">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122380"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17821">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="6"
      id="ixv-122381"
      unitRef="pure">0.0027</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="6"
      id="ixv-122382"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="6"
      id="ixv-122383"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="6"
      id="ixv-122384"
      unitRef="pure">0.0027</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17868">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="0"
      id="ixv-122385"
      unitRef="usd">28</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="0"
      id="ixv-122386"
      unitRef="usd">87</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="0"
      id="ixv-122387"
      unitRef="usd">152</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019925_Cid_C000212309"
      decimals="0"
      id="ixv-122388"
      unitRef="usd">343</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17925">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17930">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       45 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122389"
      unitRef="pure">0.45</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17943">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-17948">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            23% 
         
         
           
         International Equity Funds  
            15% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 35% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 6% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            8% 
         
         
           
         Short-Term Funds 4% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-18112">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-18121">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-18130">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-18139">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-18148">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-18157">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-18166">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-18175">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-18190">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-18199">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-18208">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-18217">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember"
      id="ixv-18226">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-18235">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-18244">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-18253">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-18262">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-18271">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-18282">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-18290">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18297">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18302">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18308"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18315"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18321"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18326">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_2020"
      decimals="INF"
      id="ixv-122390"
      unitRef="pure">0.1331</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_2021"
      decimals="INF"
      id="ixv-122391"
      unitRef="pure">0.0820</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_2022"
      decimals="INF"
      id="ixv-122392"
      unitRef="pure">-0.1549</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_2023"
      decimals="INF"
      id="ixv-122393"
      unitRef="pure">0.1205</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_2024"
      decimals="INF"
      id="ixv-122394"
      unitRef="pure">0.0678</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18421">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122395"
      unitRef="pure">0.1148</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18431">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18436">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122396"
      unitRef="pure">-0.1121</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18447">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18452">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122397"
      unitRef="pure">0.0720</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18462">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_MRI-K6-PRO"
      id="ixv-18467">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_01"
      id="ixv-18501">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122398"
      unitRef="pure">0.0678</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122399"
      unitRef="pure">0.0439</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212309_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000019925AAR_A_RBT_loc"
      unitRef="pure">0.0520</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_01"
      id="ixv-18516">
         Fidelity Managed Retirement 2025 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122401"
      unitRef="pure">0.0724</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122402"
      unitRef="pure">0.0446</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122403"
      unitRef="pure">0.0512</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-18541">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122404"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122405"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122406"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000019925_Cid_C000212309" id="ixv-18584">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18681">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2030 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18696">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18701">
     
       
     Fidelity Managed Retirement 2030 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18706">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18711">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18717">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18728">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122407"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18743">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="6"
      id="ixv-122408"
      unitRef="pure">0.0028</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="6"
      id="ixv-122409"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="6"
      id="ixv-122410"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="6"
      id="ixv-122411"
      unitRef="pure">0.0028</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18790">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="0"
      id="ixv-122412"
      unitRef="usd">29</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="0"
      id="ixv-122413"
      unitRef="usd">90</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="0"
      id="ixv-122414"
      unitRef="usd">157</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000066139_Cid_C000213720"
      decimals="0"
      id="ixv-122415"
      unitRef="usd">356</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18847">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18852">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122416"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18865">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-18870">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            26% 
         
         
           
         International Equity Funds 18% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            33% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 7% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            5% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-19034">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-19043">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-19052">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-19061">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-19070">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-19079">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-19088">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-19097">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-19112">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-19121">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-19130">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-19139">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember"
      id="ixv-19148">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-19157">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-19166">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-19175">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-19184">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-19193">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-19204">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-19212">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19219">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19224">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19230"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19237"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19243"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19248">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_2020"
      decimals="INF"
      id="ixv-122417"
      unitRef="pure">0.1407</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_2021"
      decimals="INF"
      id="ixv-122418"
      unitRef="pure">0.0910</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_2022"
      decimals="INF"
      id="ixv-122419"
      unitRef="pure">-0.1619</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_2023"
      decimals="INF"
      id="ixv-122420"
      unitRef="pure">0.1286</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_2024"
      decimals="INF"
      id="ixv-122421"
      unitRef="pure">0.0733</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19343">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122422"
      unitRef="pure">0.1247</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19353">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19358">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122423"
      unitRef="pure">-0.1240</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19369">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19374">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122424"
      unitRef="pure">0.0757</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19384">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_MRI-K6-PRO"
      id="ixv-19389">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_01"
      id="ixv-19423">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122425"
      unitRef="pure">0.0733</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122426"
      unitRef="pure">0.0479</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213720_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000066139AAR_A_RBT_loc"
      unitRef="pure">0.0588</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_01"
      id="ixv-19438">
         Fidelity Managed Retirement 2030 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122428"
      unitRef="pure">0.0779</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122429"
      unitRef="pure">0.0484</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122430"
      unitRef="pure">0.0574</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-19463">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122431"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_05"
      decimals="4"
      id="ixv-122432"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122433"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000066139_Cid_C000213720" id="ixv-19506">2019-08-16</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19603">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2035 Fund&#x2120; 
     /K6 &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19618">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19623">
     
       
     Fidelity Managed Retirement 2035 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19628">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19633">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19639">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19650">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      decimals="0"
      id="ixv-122434"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19665">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="6"
      id="ixv-122435"
      unitRef="pure">0.0028</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="6"
      id="ixv-122436"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="6"
      id="ixv-122437"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="6"
      id="ixv-122438"
      unitRef="pure">0.0028</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19712">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="0"
      id="ixv-122439"
      unitRef="usd">29</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="0"
      id="ixv-122440"
      unitRef="usd">90</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="0"
      id="ixv-122441"
      unitRef="usd">157</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000079155_Cid_C000240060"
      decimals="0"
      id="ixv-122442"
      unitRef="usd">356</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19769">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19774">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       54 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122443"
      unitRef="pure">0.54</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19787">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-19792">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            29% 
         
         
           
         International Equity Funds  
            19% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 30% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 8% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            2% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-19956">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-19965">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-19974">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-19983">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_ForeignExposureMember"
      id="ixv-19992">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_IndustryExposureMember"
      id="ixv-20001">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_PrepaymentMember"
      id="ixv-20010">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-20019">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-20034">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-20043">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_LeverageRiskMember"
      id="ixv-20052">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-20061">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_ValueInvestingMember"
      id="ixv-20070">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-20079">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-20088">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-20097">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-20106">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-20117">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-20125">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20132">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20137">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
      
       
     The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20143"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20150"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20156"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20161">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240060_2023"
      decimals="INF"
      id="ixv-122444"
      unitRef="pure">0.1351</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240060_2024"
      decimals="INF"
      id="ixv-122445"
      unitRef="pure">0.0803</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20246">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122446"
      unitRef="pure">0.0906</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20256">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20261">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122447"
      unitRef="pure">-0.0373</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20272">2023-09-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20277">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      decimals="4"
      id="ixv-122448"
      unitRef="pure">0.0786</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20287">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20292">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240060_ReturnBeforeTaxes_01"
      id="ixv-20321">
         Class K6
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240060_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122449"
      unitRef="pure">0.0803</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240060_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K6-PROS000079155AAR_A_RBT_loc"
      unitRef="pure">0.0955</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K6-PRO_01"
      id="ixv-20333">
         Fidelity Managed Retirement 2035 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122451"
      unitRef="pure">0.0833</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122452"
      unitRef="pure">0.0959</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K6-PRO_01"
      id="ixv-20352">
         S&amp;P 500&#xae; Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122453"
      unitRef="pure">0.2502</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122454"
      unitRef="pure">0.2415</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      id="ixv-20371">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K6-PRO_01"
      decimals="4"
      id="ixv-122455"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K6-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122456"
      unitRef="pure">0.0209</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000079155_Cid_C000240060" id="ixv-20403">2022-12-15</oef:AnnualReturnInceptionDate>
    <oef:PerformanceTableMarketIndexChanged
      contextRef="Pid_S000079155_contentCd_MRI-K6-PRO"
      id="ixv-20410">
     
       
     Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&amp;P 500 
       
     &#xae; 
       
     &#160; 
     Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies. 
       
     &#160; 
       
    
   </oef:PerformanceTableMarketIndexChanged>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27537">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement Income Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27552">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27557">
     
       
     Fidelity Managed Retirement Income Fund&#x2120; seeks high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27562">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27567">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27573">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27584">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122457"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27599">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="6"
      id="ixv-122458"
      unitRef="pure">0.0035</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="6"
      id="ixv-122459"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="6"
      id="ixv-122460"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="6"
      id="ixv-122461"
      unitRef="pure">0.0035</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27646">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="0"
      id="ixv-122462"
      unitRef="usd">36</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="0"
      id="ixv-122463"
      unitRef="usd">113</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="0"
      id="ixv-122464"
      unitRef="usd">197</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018468_Cid_C000212301"
      decimals="0"
      id="ixv-122465"
      unitRef="usd">443</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27703">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27708">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       52 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122466"
      unitRef="pure">0.52</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27721">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27726">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      Allocating assets among underlying Fidelity&#xae; funds and futures according to a stable neutral asset allocation of approximately: 
      
      
       
        
         
           
         U.S. Equity Funds 11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds 20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-27836">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-27845">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-27854">
     
       
      
      Stock Market Volatility. 
      
     Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-27863">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-27872">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-27881">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-27890">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-27899">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-27914">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-27923">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-27932">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-27941">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-27950">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-27959">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-27968">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-27979">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-27987">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27994">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-27999">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28005"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28012"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28018"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28023">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_2020"
      decimals="INF"
      id="ixv-122467"
      unitRef="pure">0.0867</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_2021"
      decimals="INF"
      id="ixv-122468"
      unitRef="pure">0.0287</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_2022"
      decimals="INF"
      id="ixv-122469"
      unitRef="pure">-0.1158</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_2023"
      decimals="INF"
      id="ixv-122470"
      unitRef="pure">0.0817</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_2024"
      decimals="INF"
      id="ixv-122471"
      unitRef="pure">0.0440</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28118">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122472"
      unitRef="pure">0.0650</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28128">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28133">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122473"
      unitRef="pure">-0.0610</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28144">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28149">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122474"
      unitRef="pure">0.0561</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28159">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_MRI-K-PRO"
      id="ixv-28164">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_01"
      id="ixv-28198">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122475"
      unitRef="pure">0.0440</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122476"
      unitRef="pure">0.0222</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000212301_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000018468AAR_A_RBT_loc"
      unitRef="pure">0.0263</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_01"
      id="ixv-28213">
         Fidelity Managed Retirement Income Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122478"
      unitRef="pure">0.0500</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122479"
      unitRef="pure">0.0256</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122480"
      unitRef="pure">0.0289</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-28238">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122481"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122482"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122483"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018468_Cid_C000212301" id="ixv-28281">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28376">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2010 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28391">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28396">
     
       
     Fidelity Managed Retirement 2010 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28401">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28406">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28412">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28423">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122484"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28438">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="6"
      id="ixv-122485"
      unitRef="pure">0.0035</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="6"
      id="ixv-122486"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="6"
      id="ixv-122487"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="6"
      id="ixv-122488"
      unitRef="pure">0.0035</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28485">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="0"
      id="ixv-122489"
      unitRef="usd">36</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="0"
      id="ixv-122490"
      unitRef="usd">113</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="0"
      id="ixv-122491"
      unitRef="usd">197</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018472_Cid_C000212306"
      decimals="0"
      id="ixv-122492"
      unitRef="usd">443</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28542">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28547">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122493"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28560">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28565">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-28727">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-28736">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-28745">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-28754">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-28763">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-28772">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-28781">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-28790">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-28805">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-28814">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-28823">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-28832">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-28841">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-28850">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-28859">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-28870">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-28878">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28885">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28890">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28896"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28903"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28909"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-28914">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_2020"
      decimals="INF"
      id="ixv-122494"
      unitRef="pure">0.0967</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_2021"
      decimals="INF"
      id="ixv-122495"
      unitRef="pure">0.0394</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_2022"
      decimals="INF"
      id="ixv-122496"
      unitRef="pure">-0.1231</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_2023"
      decimals="INF"
      id="ixv-122497"
      unitRef="pure">0.0862</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_2024"
      decimals="INF"
      id="ixv-122498"
      unitRef="pure">0.0458</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29009">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122499"
      unitRef="pure">0.0720</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29019">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29024">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122500"
      unitRef="pure">-0.0678</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29035">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29040">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122501"
      unitRef="pure">0.0565</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29050">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_MRI-K-PRO"
      id="ixv-29055">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_01"
      id="ixv-29089">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122502"
      unitRef="pure">0.0458</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122503"
      unitRef="pure">0.0257</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000212306_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000018472AAR_A_RBT_loc"
      unitRef="pure">0.0311</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_01"
      id="ixv-29104">
         Fidelity Managed Retirement 2010 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122505"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122506"
      unitRef="pure">0.0287</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122507"
      unitRef="pure">0.0331</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-29129">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122508"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122509"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122510"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018472_Cid_C000212306" id="ixv-29172">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29267">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2015 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29282">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29287">
     
       
     Fidelity Managed Retirement 2015 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29292">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29297">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29303">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29314">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122511"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29329">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="6"
      id="ixv-122512"
      unitRef="pure">0.0036</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="6"
      id="ixv-122513"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="6"
      id="ixv-122514"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="6"
      id="ixv-122515"
      unitRef="pure">0.0036</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29376">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="0"
      id="ixv-122516"
      unitRef="usd">37</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="0"
      id="ixv-122517"
      unitRef="usd">116</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="0"
      id="ixv-122518"
      unitRef="usd">202</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018464_Cid_C000212300"
      decimals="0"
      id="ixv-122519"
      unitRef="usd">456</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29433">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29438">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       40 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122520"
      unitRef="pure">0.40</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29451">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29456">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            15% 
         
         
           
         International Equity Funds  
            10% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 40% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 2% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            16% 
         
         
           
         Short-Term Funds 8% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-29620">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-29629">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-29638">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-29647">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-29656">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-29665">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-29674">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-29683">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-29698">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-29707">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-29716">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-29725">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-29734">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-29743">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-29752">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-29763">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-29771">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29778">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29783">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29789"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29796"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29802"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29807">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_2020"
      decimals="INF"
      id="ixv-122521"
      unitRef="pure">0.1100</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_2021"
      decimals="INF"
      id="ixv-122522"
      unitRef="pure">0.0542</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_2022"
      decimals="INF"
      id="ixv-122523"
      unitRef="pure">-0.1343</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_2023"
      decimals="INF"
      id="ixv-122524"
      unitRef="pure">0.0972</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_2024"
      decimals="INF"
      id="ixv-122525"
      unitRef="pure">0.0530</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29902">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122526"
      unitRef="pure">0.0875</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29912">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29917">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122527"
      unitRef="pure">-0.0786</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29928">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29933">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122528"
      unitRef="pure">0.0616</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29943">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_MRI-K-PRO"
      id="ixv-29948">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_01"
      id="ixv-29982">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122529"
      unitRef="pure">0.0530</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122530"
      unitRef="pure">0.0319</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000212300_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000018464AAR_A_RBT_loc"
      unitRef="pure">0.0383</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_01"
      id="ixv-29997">
         Fidelity Managed Retirement 2015 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122532"
      unitRef="pure">0.0587</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122533"
      unitRef="pure">0.0344</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122534"
      unitRef="pure">0.0396</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-30022">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122535"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122536"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122537"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000018464_Cid_C000212300" id="ixv-30065">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30160">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2020 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30175">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30180">
     
       
     Fidelity Managed Retirement 2020 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30185">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30190">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30196">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30207">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122538"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30222">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="6"
      id="ixv-122539"
      unitRef="pure">0.0037</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="6"
      id="ixv-122540"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="6"
      id="ixv-122541"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="6"
      id="ixv-122542"
      unitRef="pure">0.0037</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30269">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="0"
      id="ixv-122543"
      unitRef="usd">38</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="0"
      id="ixv-122544"
      unitRef="usd">119</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="0"
      id="ixv-122545"
      unitRef="usd">208</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019923_Cid_C000212308"
      decimals="0"
      id="ixv-122546"
      unitRef="usd">468</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30326">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30331">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       39 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122547"
      unitRef="pure">0.39</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30344">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30349">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            19% 
         
         
           
         International Equity Funds 13% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            38% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 4% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            12% 
         
         
           
         Short-Term Funds 6% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-30513">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-30522">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-30531">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-30540">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-30549">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-30558">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-30567">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-30576">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-30591">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-30600">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-30609">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-30618">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-30627">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-30636">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-30645">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-30656">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-30664">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30671">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30676">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30682"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30689"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30695"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30700">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_2020"
      decimals="INF"
      id="ixv-122548"
      unitRef="pure">0.1219</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_2021"
      decimals="INF"
      id="ixv-122549"
      unitRef="pure">0.0686</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_2022"
      decimals="INF"
      id="ixv-122550"
      unitRef="pure">-0.1456</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_2023"
      decimals="INF"
      id="ixv-122551"
      unitRef="pure">0.1084</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_2024"
      decimals="INF"
      id="ixv-122552"
      unitRef="pure">0.0597</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30795">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122553"
      unitRef="pure">0.1029</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30805">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30810">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122554"
      unitRef="pure">-0.0979</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30821">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30826">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122555"
      unitRef="pure">0.0665</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30836">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_MRI-K-PRO"
      id="ixv-30841">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_01"
      id="ixv-30875">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122556"
      unitRef="pure">0.0597</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122557"
      unitRef="pure">0.0377</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000212308_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000019923AAR_A_RBT_loc"
      unitRef="pure">0.0450</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_01"
      id="ixv-30890">
         Fidelity Managed Retirement 2020 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122559"
      unitRef="pure">0.0655</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122560"
      unitRef="pure">0.0398</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122561"
      unitRef="pure">0.0459</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-30915">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122562"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122563"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122564"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000019923_Cid_C000212308" id="ixv-30958">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31053">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2025 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31068">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31073">
     
       
     Fidelity Managed Retirement 2025 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31078">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31083">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31089">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31100">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122565"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31115">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="6"
      id="ixv-122566"
      unitRef="pure">0.0037</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="6"
      id="ixv-122567"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="6"
      id="ixv-122568"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="6"
      id="ixv-122569"
      unitRef="pure">0.0037</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31162">
     
       
      
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="0"
      id="ixv-122570"
      unitRef="usd">38</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="0"
      id="ixv-122571"
      unitRef="usd">119</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="0"
      id="ixv-122572"
      unitRef="usd">208</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019925_Cid_C000212310"
      decimals="0"
      id="ixv-122573"
      unitRef="usd">468</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31220">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31225">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       45 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122574"
      unitRef="pure">0.45</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31238">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31243">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            23% 
         
         
           
         International Equity Funds  
            15% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 35% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 6% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            8% 
         
         
           
         Short-Term Funds 4% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-31407">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-31416">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-31425">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-31434">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-31443">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-31452">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-31461">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-31470">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-31485">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-31494">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-31503">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-31512">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember"
      id="ixv-31521">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-31530">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-31539">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-31548">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-31557">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-31566">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-31577">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-31585">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31592">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31597">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31603"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31610"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31616"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31621">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_2020"
      decimals="INF"
      id="ixv-122575"
      unitRef="pure">0.1320</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_2021"
      decimals="INF"
      id="ixv-122576"
      unitRef="pure">0.0810</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_2022"
      decimals="INF"
      id="ixv-122577"
      unitRef="pure">-0.1559</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_2023"
      decimals="INF"
      id="ixv-122578"
      unitRef="pure">0.1194</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_2024"
      decimals="INF"
      id="ixv-122579"
      unitRef="pure">0.0667</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31716">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122580"
      unitRef="pure">0.1146</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31726">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31731">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122581"
      unitRef="pure">-0.1121</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31742">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31747">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122582"
      unitRef="pure">0.0716</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31757">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_MRI-K-PRO"
      id="ixv-31762">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_01"
      id="ixv-31796">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122583"
      unitRef="pure">0.0667</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122584"
      unitRef="pure">0.0429</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000212310_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000019925AAR_A_RBT_loc"
      unitRef="pure">0.0509</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_01"
      id="ixv-31811">
         Fidelity Managed Retirement 2025 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122586"
      unitRef="pure">0.0724</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122587"
      unitRef="pure">0.0446</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122588"
      unitRef="pure">0.0512</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-31836">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122589"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122590"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122591"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000019925_Cid_C000212310" id="ixv-31879">2019-08-01</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-31974">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2030 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-31989">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-31994">
     
       
     Fidelity Managed Retirement 2030 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-31999">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32004">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32010">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32021">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122592"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32036">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="6"
      id="ixv-122593"
      unitRef="pure">0.0038</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="6"
      id="ixv-122594"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="6"
      id="ixv-122595"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="6"
      id="ixv-122596"
      unitRef="pure">0.0038</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32083">
     
       
      
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="0"
      id="ixv-122597"
      unitRef="usd">39</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="0"
      id="ixv-122598"
      unitRef="usd">122</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="0"
      id="ixv-122599"
      unitRef="usd">213</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000066139_Cid_C000213718"
      decimals="0"
      id="ixv-122600"
      unitRef="usd">480</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32141">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32146">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122601"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32159">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32164">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            26% 
         
         
           
         International Equity Funds 18% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            33% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 7% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            5% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-32328">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-32337">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-32346">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-32355">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-32364">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-32373">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-32382">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-32391">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-32406">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-32415">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-32424">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-32433">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember"
      id="ixv-32442">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-32451">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-32460">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-32469">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-32478">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-32487">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-32498">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-32506">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32513">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32518">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32524"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32531"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32537"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32542">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_2020"
      decimals="INF"
      id="ixv-122602"
      unitRef="pure">0.1397</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_2021"
      decimals="INF"
      id="ixv-122603"
      unitRef="pure">0.0895</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_2022"
      decimals="INF"
      id="ixv-122604"
      unitRef="pure">-0.1625</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_2023"
      decimals="INF"
      id="ixv-122605"
      unitRef="pure">0.1274</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_2024"
      decimals="INF"
      id="ixv-122606"
      unitRef="pure">0.0718</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32637">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122607"
      unitRef="pure">0.1245</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32647">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32652">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122608"
      unitRef="pure">-0.1241</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32663">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32668">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122609"
      unitRef="pure">0.0752</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32678">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_MRI-K-PRO"
      id="ixv-32683">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_01"
      id="ixv-32717">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122610"
      unitRef="pure">0.0718</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122611"
      unitRef="pure">0.0468</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213718_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000066139AAR_A_RBT_loc"
      unitRef="pure">0.0576</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_01"
      id="ixv-32732">
         Fidelity Managed Retirement 2030 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122613"
      unitRef="pure">0.0779</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122614"
      unitRef="pure">0.0484</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122615"
      unitRef="pure">0.0574</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-32757">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122616"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_05"
      decimals="4"
      id="ixv-122617"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122618"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000066139_Cid_C000213718" id="ixv-32800">2019-08-16</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32895">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2035 Fund&#x2120; 
     /K &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32910">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32915">
     
       
     Fidelity Managed Retirement 2035 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32920">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32925">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32931">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32942">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      decimals="0"
      id="ixv-122619"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-32957">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="6"
      id="ixv-122620"
      unitRef="pure">0.0038</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="6"
      id="ixv-122621"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="6"
      id="ixv-122622"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="6"
      id="ixv-122623"
      unitRef="pure">0.0038</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33004">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="0"
      id="ixv-122624"
      unitRef="usd">39</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="0"
      id="ixv-122625"
      unitRef="usd">122</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="0"
      id="ixv-122626"
      unitRef="usd">213</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000079155_Cid_C000240062"
      decimals="0"
      id="ixv-122627"
      unitRef="usd">480</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33061">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33066">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       54 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122628"
      unitRef="pure">0.54</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33079">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33084">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            29% 
         
         
           
         International Equity Funds  
            19% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 30% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 8% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            2% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-33248">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-33257">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-33266">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-33275">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_ForeignExposureMember"
      id="ixv-33284">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_IndustryExposureMember"
      id="ixv-33293">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_PrepaymentMember"
      id="ixv-33302">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-33311">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-33326">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-33335">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_LeverageRiskMember"
      id="ixv-33344">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-33353">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_ValueInvestingMember"
      id="ixv-33362">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-33371">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-33380">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-33389">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-33398">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-33409">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-33417">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33424">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33429">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
      
       
     The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.401k.com  
      
       
     and log in for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33435"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33442"> 
        
      Past performance is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33448"> 
        
      www.401k.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33453">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240062_2023"
      decimals="INF"
      id="ixv-122629"
      unitRef="pure">0.1346</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240062_2024"
      decimals="INF"
      id="ixv-122630"
      unitRef="pure">0.0782</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33538">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122631"
      unitRef="pure">0.0910</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33548">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33553">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122632"
      unitRef="pure">-0.0377</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33564">2023-09-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33569">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      decimals="4"
      id="ixv-122633"
      unitRef="pure">0.0781</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33579">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33584">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240062_ReturnBeforeTaxes_01"
      id="ixv-33613">
         Class K
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240062_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122634"
      unitRef="pure">0.0782</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240062_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteMRI-K-PROS000079155AAR_A_RBT_loc"
      unitRef="pure">0.0942</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K-PRO_01"
      id="ixv-33625">
         Fidelity Managed Retirement 2035 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122636"
      unitRef="pure">0.0833</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122637"
      unitRef="pure">0.0959</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K-PRO_01"
      id="ixv-33644">
         S&amp;P 500&#xae; Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122638"
      unitRef="pure">0.2502</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122639"
      unitRef="pure">0.2415</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K-PRO_01"
      id="ixv-33663">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K-PRO_01"
      decimals="4"
      id="ixv-122640"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_MRI-K-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122641"
      unitRef="pure">0.0209</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000079155_Cid_C000240062" id="ixv-33695">2022-12-15</oef:AnnualReturnInceptionDate>
    <oef:PerformanceTableMarketIndexChanged
      contextRef="Pid_S000079155_contentCd_MRI-K-PRO"
      id="ixv-33702">
     
       
     Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&amp;P 500 
       
     &#xae; 
       
     &#160; 
     Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies. 
       
     &#160; 
       
    
   </oef:PerformanceTableMarketIndexChanged>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40854">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement Income Fund&#x2120; 
     /Fidelity Advisor Managed Retirement Income Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40869">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40874">
     
       
     Fidelity Managed Retirement Income Fund&#x2120; seeks high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40879">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40884">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40890">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40896"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122642"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40921">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="4"
      id="ixv-122643"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="4"
      id="ixv-122644"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="4"
      id="footnoteAMRI-PROS000018468SHF_AC000051091"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="4"
      id="ixv-122646"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40984"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-40989">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="6"
      id="ixv-122647"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="6"
      id="ixv-122648"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="6"
      id="ixv-122649"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="6"
      id="ixv-122650"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="6"
      id="ixv-122651"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="6"
      id="ixv-122652"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="6"
      id="ixv-122653"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="6"
      id="ixv-122654"
      unitRef="pure">0.0045</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41068">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="0"
      id="ixv-122655"
      unitRef="usd">642</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="0"
      id="ixv-122656"
      unitRef="usd">46</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="0"
      id="ixv-122657"
      unitRef="usd">786</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="0"
      id="ixv-122658"
      unitRef="usd">144</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="0"
      id="ixv-122659"
      unitRef="usd">942</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="0"
      id="ixv-122660"
      unitRef="usd">252</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018468_Cid_C000051091"
      decimals="0"
      id="ixv-122661"
      unitRef="usd">1395</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018468_Cid_C000051094"
      decimals="0"
      id="ixv-122662"
      unitRef="usd">567</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41153">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41158">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       52 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122663"
      unitRef="pure">0.52</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41171">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41176">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      Allocating assets among underlying Fidelity&#xae; funds and futures according to a stable neutral asset allocation of approximately: 
      
      
       
        
         
           
         U.S. Equity Funds 11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds 20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-41286">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-41295">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-41304">
     
       
      
      Stock Market Volatility. 
      
     Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-41313">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-41322">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-41331">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-41340">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-41349">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-41364">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-41373">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-41382">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-41391">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-41400">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-41409">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-41418">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-41427">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-41435">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41442">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41447">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41452"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41461"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41469"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41474">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41478">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41481"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2015"
      decimals="INF"
      id="ixv-122664"
      unitRef="pure">-0.0052</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2016"
      decimals="INF"
      id="ixv-122665"
      unitRef="pure">0.0498</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2017"
      decimals="INF"
      id="ixv-122666"
      unitRef="pure">0.0682</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2018"
      decimals="INF"
      id="ixv-122667"
      unitRef="pure">-0.0205</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2019"
      decimals="INF"
      id="ixv-122668"
      unitRef="pure">0.1028</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2020"
      decimals="INF"
      id="ixv-122669"
      unitRef="pure">0.0830</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2021"
      decimals="INF"
      id="ixv-122670"
      unitRef="pure">0.0251</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2022"
      decimals="INF"
      id="ixv-122671"
      unitRef="pure">-0.1188</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2023"
      decimals="INF"
      id="ixv-122672"
      unitRef="pure">0.0780</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_2024"
      decimals="INF"
      id="ixv-122673"
      unitRef="pure">0.0404</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41594">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122674"
      unitRef="pure">0.0641</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41604">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41609">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122675"
      unitRef="pure">-0.0619</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41620">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41625">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122676"
      unitRef="pure">0.0543</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41635">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41640">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41645">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41648"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41653"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41658"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41664"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000018468_contentCd_AMRI-PRO"
      id="ixv-41668"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_01"
      id="ixv-41699">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122677"
      unitRef="pure">-0.0195</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122678"
      unitRef="pure">0.0067</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122679"
      unitRef="pure">0.0222</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_01"
      id="ixv-41717">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122680"
      unitRef="pure">-0.0295</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122681"
      unitRef="pure">-0.0039</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122682"
      unitRef="pure">0.0114</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-41735">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122683"
      unitRef="pure">-0.0106</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122684"
      unitRef="pure">0.0015</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051091_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122685"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_01"
      id="ixv-41751">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122686"
      unitRef="pure">0.0430</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122687"
      unitRef="pure">0.0213</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Cid_C000051094_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122688"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_01"
      id="ixv-41765">
         Fidelity Managed Retirement Income Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122689"
      unitRef="pure">0.0500</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122690"
      unitRef="pure">0.0256</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_IXZNC_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122691"
      unitRef="pure">0.0342</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-41790">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122692"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122693"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018468_Indexid_LB001_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122694"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41894">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2010 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2010 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41909">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41914">
     
       
     Fidelity Managed Retirement 2010 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41919">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41924">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41930">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41936"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122695"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-41961">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="4"
      id="ixv-122696"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="4"
      id="ixv-122697"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="4"
      id="footnoteAMRI-PROS000018472SHF_AC000051111"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="4"
      id="ixv-122699"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42024"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42029">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="6"
      id="ixv-122700"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="6"
      id="ixv-122701"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="6"
      id="ixv-122702"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="6"
      id="ixv-122703"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="6"
      id="ixv-122704"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="6"
      id="ixv-122705"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="6"
      id="ixv-122706"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="6"
      id="ixv-122707"
      unitRef="pure">0.0045</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42108">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="0"
      id="ixv-122708"
      unitRef="usd">642</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="0"
      id="ixv-122709"
      unitRef="usd">46</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="0"
      id="ixv-122710"
      unitRef="usd">786</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="0"
      id="ixv-122711"
      unitRef="usd">144</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="0"
      id="ixv-122712"
      unitRef="usd">942</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="0"
      id="ixv-122713"
      unitRef="usd">252</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018472_Cid_C000051111"
      decimals="0"
      id="ixv-122714"
      unitRef="usd">1395</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018472_Cid_C000051114"
      decimals="0"
      id="ixv-122715"
      unitRef="usd">567</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42193">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42198">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122716"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42211">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42216">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            11% 
         
         
           
         International Equity Funds 8% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 43% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 0% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            20% 
         
         
           
         Short-Term Funds 10% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-42378">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-42387">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-42396">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-42405">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-42414">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-42423">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-42432">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-42441">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-42456">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-42465">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-42474">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-42483">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-42492">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-42501">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-42510">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-42519">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-42527">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42534">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42539">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42544"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42553"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42561"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42566">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42570">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42573"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2015"
      decimals="INF"
      id="ixv-122717"
      unitRef="pure">-0.0038</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2016"
      decimals="INF"
      id="ixv-122718"
      unitRef="pure">0.0661</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2017"
      decimals="INF"
      id="ixv-122719"
      unitRef="pure">0.1033</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2018"
      decimals="INF"
      id="ixv-122720"
      unitRef="pure">-0.0307</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2019"
      decimals="INF"
      id="ixv-122721"
      unitRef="pure">0.1233</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2020"
      decimals="INF"
      id="ixv-122722"
      unitRef="pure">0.0931</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2021"
      decimals="INF"
      id="ixv-122723"
      unitRef="pure">0.0356</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2022"
      decimals="INF"
      id="ixv-122724"
      unitRef="pure">-0.1261</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2023"
      decimals="INF"
      id="ixv-122725"
      unitRef="pure">0.0824</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_2024"
      decimals="INF"
      id="ixv-122726"
      unitRef="pure">0.0421</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42686">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122727"
      unitRef="pure">0.0711</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42696">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42701">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122728"
      unitRef="pure">-0.0687</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42712">2022-06-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42717">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122729"
      unitRef="pure">0.0546</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42727">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42732">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42737">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42740"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42745"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42750"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42756"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000018472_contentCd_AMRI-PRO"
      id="ixv-42760"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_01"
      id="ixv-42791">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122730"
      unitRef="pure">-0.0178</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122731"
      unitRef="pure">0.0101</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122732"
      unitRef="pure">0.0298</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_01"
      id="ixv-42809">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122733"
      unitRef="pure">-0.0276</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122734"
      unitRef="pure">-0.0021</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122735"
      unitRef="pure">0.0155</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-42827">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122736"
      unitRef="pure">-0.0096</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122737"
      unitRef="pure">0.0042</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051111_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122738"
      unitRef="pure">0.0193</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_01"
      id="ixv-42843">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122739"
      unitRef="pure">0.0448</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122740"
      unitRef="pure">0.0247</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Cid_C000051114_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122741"
      unitRef="pure">0.0386</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_01"
      id="ixv-42857">
         Fidelity Managed Retirement 2010 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122742"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122743"
      unitRef="pure">0.0287</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_IXZNG_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122744"
      unitRef="pure">0.0420</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-42882">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122745"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122746"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018472_Indexid_LB001_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122747"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-42986">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2015 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2015 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43001">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43006">
     
       
     Fidelity Managed Retirement 2015 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43011">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43016">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43022">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43028"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122748"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43053">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="4"
      id="ixv-122749"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="4"
      id="ixv-122750"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="4"
      id="footnoteAMRI-PROS000018464SHF_AC000051071"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="4"
      id="ixv-122752"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43116"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43121">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="6"
      id="ixv-122753"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="6"
      id="ixv-122754"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="6"
      id="ixv-122755"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="6"
      id="ixv-122756"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="6"
      id="ixv-122757"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="6"
      id="ixv-122758"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="6"
      id="ixv-122759"
      unitRef="pure">0.0071</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="6"
      id="ixv-122760"
      unitRef="pure">0.0046</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43200">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="0"
      id="ixv-122761"
      unitRef="usd">643</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="0"
      id="ixv-122762"
      unitRef="usd">47</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="0"
      id="ixv-122763"
      unitRef="usd">789</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="0"
      id="ixv-122764"
      unitRef="usd">148</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="0"
      id="ixv-122765"
      unitRef="usd">947</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="0"
      id="ixv-122766"
      unitRef="usd">258</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018464_Cid_C000051071"
      decimals="0"
      id="ixv-122767"
      unitRef="usd">1407</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000018464_Cid_C000051074"
      decimals="0"
      id="ixv-122768"
      unitRef="usd">579</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43285">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43290">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       40 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122769"
      unitRef="pure">0.40</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43303">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43308">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            15% 
         
         
           
         International Equity Funds  
            10% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 40% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 2% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            16% 
         
         
           
         Short-Term Funds 8% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-43472">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-43481">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-43490">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-43499">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-43508">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-43517">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-43526">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-43535">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-43550">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-43559">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-43568">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-43577">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-43586">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-43595">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-43604">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-43613">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-43621">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43628">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43633">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43638"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43647"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43655"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43660">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43664">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43667"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2015"
      decimals="INF"
      id="ixv-122770"
      unitRef="pure">-0.0031</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2016"
      decimals="INF"
      id="ixv-122771"
      unitRef="pure">0.0677</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2017"
      decimals="INF"
      id="ixv-122772"
      unitRef="pure">0.1176</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2018"
      decimals="INF"
      id="ixv-122773"
      unitRef="pure">-0.0390</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2019"
      decimals="INF"
      id="ixv-122774"
      unitRef="pure">0.1414</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2020"
      decimals="INF"
      id="ixv-122775"
      unitRef="pure">0.1061</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2021"
      decimals="INF"
      id="ixv-122776"
      unitRef="pure">0.0506</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2022"
      decimals="INF"
      id="ixv-122777"
      unitRef="pure">-0.1375</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2023"
      decimals="INF"
      id="ixv-122778"
      unitRef="pure">0.0937</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_2024"
      decimals="INF"
      id="ixv-122779"
      unitRef="pure">0.0492</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43780">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122780"
      unitRef="pure">0.0867</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43790">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43795">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122781"
      unitRef="pure">-0.0794</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43806">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43811">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122782"
      unitRef="pure">0.0597</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43821">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43826">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43831">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43834"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43839"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43844"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43850"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000018464_contentCd_AMRI-PRO"
      id="ixv-43854"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_01"
      id="ixv-43885">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122783"
      unitRef="pure">-0.0112</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122784"
      unitRef="pure">0.0162</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122785"
      unitRef="pure">0.0353</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_01"
      id="ixv-43903">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122786"
      unitRef="pure">-0.0205</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122787"
      unitRef="pure">0.0046</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122788"
      unitRef="pure">0.0196</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-43920">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122789"
      unitRef="pure">-0.0055</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122790"
      unitRef="pure">0.0090</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051071_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122791"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_01"
      id="ixv-43936">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122792"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122793"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Cid_C000051074_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122794"
      unitRef="pure">0.0440</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_01"
      id="ixv-43950">
         Fidelity Managed Retirement 2015 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122795"
      unitRef="pure">0.0587</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122796"
      unitRef="pure">0.0344</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_IXZNI_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122797"
      unitRef="pure">0.0474</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-43975">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122798"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122799"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000018464_Indexid_LB001_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122800"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44079">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2020 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2020 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44094">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44099">
     
       
     Fidelity Managed Retirement 2020 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44104">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44109">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44115">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44121"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122801"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44146">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="4"
      id="ixv-122802"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="4"
      id="ixv-122803"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="4"
      id="footnoteAMRI-PROS000019923SHF_AC000055913"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="4"
      id="ixv-122805"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44209"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44214">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="6"
      id="ixv-122806"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="6"
      id="ixv-122807"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="6"
      id="ixv-122808"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="6"
      id="ixv-122809"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="6"
      id="ixv-122810"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="6"
      id="ixv-122811"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="6"
      id="ixv-122812"
      unitRef="pure">0.0072</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="6"
      id="ixv-122813"
      unitRef="pure">0.0047</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44293">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="0"
      id="ixv-122814"
      unitRef="usd">644</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="0"
      id="ixv-122815"
      unitRef="usd">48</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="0"
      id="ixv-122816"
      unitRef="usd">792</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="0"
      id="ixv-122817"
      unitRef="usd">151</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="0"
      id="ixv-122818"
      unitRef="usd">953</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="0"
      id="ixv-122819"
      unitRef="usd">263</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019923_Cid_C000055913"
      decimals="0"
      id="ixv-122820"
      unitRef="usd">1418</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019923_Cid_C000055916"
      decimals="0"
      id="ixv-122821"
      unitRef="usd">591</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44378">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44383">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       39 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122822"
      unitRef="pure">0.39</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44396">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44401">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            19% 
         
         
           
         International Equity Funds 13% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            38% 
         
         
           
         Long-Term Treasury Bond Funds 3% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 4% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            12% 
         
         
           
         Short-Term Funds 6% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-44565">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-44574">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-44583">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-44592">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-44601">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-44610">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-44619">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-44628">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-44643">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-44652">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-44661">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-44670">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-44679">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-44688">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-44697">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-44706">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-44714">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44721">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44726">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44731"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44740"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44748"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44753">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44757">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44760"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2015"
      decimals="INF"
      id="ixv-122823"
      unitRef="pure">-0.0024</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2016"
      decimals="INF"
      id="ixv-122824"
      unitRef="pure">0.0680</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2017"
      decimals="INF"
      id="ixv-122825"
      unitRef="pure">0.1301</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2018"
      decimals="INF"
      id="ixv-122826"
      unitRef="pure">-0.0469</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2019"
      decimals="INF"
      id="ixv-122827"
      unitRef="pure">0.1589</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2020"
      decimals="INF"
      id="ixv-122828"
      unitRef="pure">0.1178</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2021"
      decimals="INF"
      id="ixv-122829"
      unitRef="pure">0.0649</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2022"
      decimals="INF"
      id="ixv-122830"
      unitRef="pure">-0.1485</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2023"
      decimals="INF"
      id="ixv-122831"
      unitRef="pure">0.1044</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_2024"
      decimals="INF"
      id="ixv-122832"
      unitRef="pure">0.0560</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44873">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122833"
      unitRef="pure">0.1020</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44883">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44888">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122834"
      unitRef="pure">-0.0988</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44899">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44904">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122835"
      unitRef="pure">0.0647</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44914">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44919">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44924">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44927"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44932"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44937"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44943"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000019923_contentCd_AMRI-PRO"
      id="ixv-44947"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_01"
      id="ixv-44978">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122836"
      unitRef="pure">-0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122837"
      unitRef="pure">0.0218</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122838"
      unitRef="pure">0.0401</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_01"
      id="ixv-44996">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122839"
      unitRef="pure">-0.0132</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122840"
      unitRef="pure">0.0112</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122841"
      unitRef="pure">0.0247</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-45013">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122842"
      unitRef="pure">-0.0014</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122843"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055913_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122844"
      unitRef="pure">0.0272</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_01"
      id="ixv-45029">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122845"
      unitRef="pure">0.0586</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122846"
      unitRef="pure">0.0366</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Cid_C000055916_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122847"
      unitRef="pure">0.0489</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_01"
      id="ixv-45043">
         Fidelity Managed Retirement 2020 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122848"
      unitRef="pure">0.0655</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122849"
      unitRef="pure">0.0398</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_IXZNK_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122850"
      unitRef="pure">0.0523</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-45068">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122851"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122852"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019923_Indexid_LB001_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122853"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45172">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2025 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2025 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45187">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45192">
     
       
     Fidelity Managed Retirement 2025 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45197">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45202">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45208">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45214"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122854"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45239">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="4"
      id="ixv-122855"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="4"
      id="ixv-122856"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="4"
      id="footnoteAMRI-PROS000019925SHF_AC000055923"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="4"
      id="ixv-122858"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45302"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45307">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="6"
      id="ixv-122859"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="6"
      id="ixv-122860"
      unitRef="pure">0.0047</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="6"
      id="ixv-122861"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="6"
      id="ixv-122862"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="6"
      id="ixv-122863"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="6"
      id="ixv-122864"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="6"
      id="ixv-122865"
      unitRef="pure">0.0072</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="6"
      id="ixv-122866"
      unitRef="pure">0.0047</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45386">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="0"
      id="ixv-122867"
      unitRef="usd">644</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="0"
      id="ixv-122868"
      unitRef="usd">48</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="0"
      id="ixv-122869"
      unitRef="usd">792</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="0"
      id="ixv-122870"
      unitRef="usd">151</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="0"
      id="ixv-122871"
      unitRef="usd">953</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="0"
      id="ixv-122872"
      unitRef="usd">263</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019925_Cid_C000055923"
      decimals="0"
      id="ixv-122873"
      unitRef="usd">1418</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000019925_Cid_C000055926"
      decimals="0"
      id="ixv-122874"
      unitRef="usd">591</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45471">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45476">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       45 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122875"
      unitRef="pure">0.45</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45489">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45494">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            23% 
         
         
           
         International Equity Funds  
            15% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 35% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 6% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            8% 
         
         
           
         Short-Term Funds 4% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-45658">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-45667">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-45676">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-45685">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-45694">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-45703">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-45712">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-45721">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-45736">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-45745">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-45754">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-45763">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-45772">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-45781">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-45790">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-45799">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-45808">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-45817">
     
       
      
      Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-45826">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-45834">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45841">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45846">
     
       
     The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has 
       
     characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. 
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45851"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45860"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45868"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45873">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45877">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45880"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2015"
      decimals="INF"
      id="ixv-122876"
      unitRef="pure">-0.0015</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2016"
      decimals="INF"
      id="ixv-122877"
      unitRef="pure">0.0684</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2017"
      decimals="INF"
      id="ixv-122878"
      unitRef="pure">0.1394</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2018"
      decimals="INF"
      id="ixv-122879"
      unitRef="pure">-0.0530</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2019"
      decimals="INF"
      id="ixv-122880"
      unitRef="pure">0.1723</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2020"
      decimals="INF"
      id="ixv-122881"
      unitRef="pure">0.1279</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2021"
      decimals="INF"
      id="ixv-122882"
      unitRef="pure">0.0772</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2022"
      decimals="INF"
      id="ixv-122883"
      unitRef="pure">-0.1588</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2023"
      decimals="INF"
      id="ixv-122884"
      unitRef="pure">0.1155</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_2024"
      decimals="INF"
      id="ixv-122885"
      unitRef="pure">0.0630</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-45993">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122886"
      unitRef="pure">0.1136</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46003">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46008">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122887"
      unitRef="pure">-0.1130</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46019">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46024">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122888"
      unitRef="pure">0.0696</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46034">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46039">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46044">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46047"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46052"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46057"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46063"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000019925_contentCd_AMRI-PRO"
      id="ixv-46067"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_01"
      id="ixv-46098">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122889"
      unitRef="pure">0.0019</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122890"
      unitRef="pure">0.0270</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122891"
      unitRef="pure">0.0442</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_01"
      id="ixv-46115">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122892"
      unitRef="pure">-0.0061</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122893"
      unitRef="pure">0.0159</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-122894"
      unitRef="pure">0.0284</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-46132">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122895"
      unitRef="pure">0.0026</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122896"
      unitRef="pure">0.0176</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055923_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-122897"
      unitRef="pure">0.0305</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_01"
      id="ixv-46147">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122898"
      unitRef="pure">0.0655</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122899"
      unitRef="pure">0.0418</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Cid_C000055926_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-122900"
      unitRef="pure">0.0531</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_01"
      id="ixv-46161">
         Fidelity Managed Retirement 2025 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122901"
      unitRef="pure">0.0724</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122902"
      unitRef="pure">0.0446</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_IXZNL_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122903"
      unitRef="pure">0.0564</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-46186">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122904"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122905"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000019925_Indexid_LB001_contentCd_AMRI-PRO_10"
      decimals="4"
      id="ixv-122906"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46290">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2030 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2030 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46305">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46310">
     
       
     Fidelity Managed Retirement 2030 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46315">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46320">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46326">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46332"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122907"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46357">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="4"
      id="ixv-122908"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="4"
      id="ixv-122909"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="4"
      id="footnoteAMRI-PROS000066139SHF_AC000213721"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="4"
      id="ixv-122911"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46420"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46425">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="6"
      id="ixv-122912"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="6"
      id="ixv-122913"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="6"
      id="ixv-122914"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="6"
      id="ixv-122915"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="6"
      id="ixv-122916"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="6"
      id="ixv-122917"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="6"
      id="ixv-122918"
      unitRef="pure">0.0073</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="6"
      id="ixv-122919"
      unitRef="pure">0.0048</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46504">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="0"
      id="ixv-122920"
      unitRef="usd">645</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="0"
      id="ixv-122921"
      unitRef="usd">49</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="0"
      id="ixv-122922"
      unitRef="usd">795</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="0"
      id="ixv-122923"
      unitRef="usd">154</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="0"
      id="ixv-122924"
      unitRef="usd">958</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="0"
      id="ixv-122925"
      unitRef="usd">269</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000066139_Cid_C000213721"
      decimals="0"
      id="ixv-122926"
      unitRef="usd">1429</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000066139_Cid_C000213723"
      decimals="0"
      id="ixv-122927"
      unitRef="usd">604</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46589">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46594">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       59 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122928"
      unitRef="pure">0.59</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46607">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46612">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            26% 
         
         
           
         International Equity Funds 18% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds  
            33% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 7% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            5% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-46776">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-46785">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-46794">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-46803">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-46812">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-46821">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-46830">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-46839">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-46854">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-46863">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-46872">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-46881">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-46890">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_InflationProtectedDebtExposureMember"
      id="ixv-46899">
     
       
      
      Inflation-Protected Debt Exposure. 
      
     Increases in real interest rates can cause the price of inflation-protected debt securities to decrease. Interest payments on inflation-protected debt securities can be unpredictable. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-46908">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-46917">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-46926">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-46935">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-46946">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-46954">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46961">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46966">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
      
       
     The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46972"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46979"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46985"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46990">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46994">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-46997"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_2020"
      decimals="INF"
      id="ixv-122929"
      unitRef="pure">0.1355</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_2021"
      decimals="INF"
      id="ixv-122930"
      unitRef="pure">0.0854</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_2022"
      decimals="INF"
      id="ixv-122931"
      unitRef="pure">-0.1648</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_2023"
      decimals="INF"
      id="ixv-122932"
      unitRef="pure">0.1228</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_2024"
      decimals="INF"
      id="ixv-122933"
      unitRef="pure">0.0688</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47093">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122934"
      unitRef="pure">0.1236</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47103">2020-06-30</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47108">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122935"
      unitRef="pure">-0.1246</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47119">2020-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47124">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122936"
      unitRef="pure">0.0732</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47134">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47139">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47145">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47148"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47153"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47158"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47164"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000066139_contentCd_AMRI-PRO"
      id="ixv-47168"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_01"
      id="ixv-47199">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122937"
      unitRef="pure">0.0074</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122938"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000066139AAR_A_RBT_loc"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_01"
      id="ixv-47217">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122940"
      unitRef="pure">0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-122941"
      unitRef="pure">0.0208</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000066139AAR_A_ATD_loc"
      unitRef="pure">0.0321</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-47233">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122943"
      unitRef="pure">0.0065</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-122944"
      unitRef="pure">0.0209</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213721_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000066139AAR_A_ATDS_loc"
      unitRef="pure">0.0299</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_01"
      id="ixv-47249">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122946"
      unitRef="pure">0.0709</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-122947"
      unitRef="pure">0.0458</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Cid_C000213723_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000066139AAR_B_RBT_loc"
      unitRef="pure">0.0566</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_01"
      id="ixv-47264">
         Fidelity Managed Retirement 2030 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122949"
      unitRef="pure">0.0779</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122950"
      unitRef="pure">0.0484</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_IXXRV_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122951"
      unitRef="pure">0.0574</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-47289">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122952"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_05"
      decimals="4"
      id="ixv-122953"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000066139_Indexid_LB001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122954"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000066139_Cid_C000213721" id="ixv-47332">2019-08-16</oef:AnnualReturnInceptionDate>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000066139_Cid_C000213723" id="ixv-47346">2019-08-16</oef:AnnualReturnInceptionDate>
    <oef:RiskReturnHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47419">
     
       
     Fund Summary 
       
     Fund /Class: 
     Fidelity Managed Retirement 2035 Fund&#x2120; 
     /Fidelity Advisor Managed Retirement 2035 Fund&#x2120; A, I &#160; 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47434">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47439">
     
       
     Fidelity Managed Retirement 2035 Fund&#x2120; seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a  
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ObjectiveSecondaryTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47444">
     
       
     secondary objective, capital appreciation. 
       
    
   </oef:ObjectiveSecondaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47449">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47455">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. 
      
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
      
       
      
       
     and in 
      the sales charge 
      
       
      waiver appendix to 
      the prospectus. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47461"> 
        
      You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 
        
       
         
       50,000 
         
       
        
      in the fund or certain other Fidelity 
        
      &#xae; 
        
      funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page  
       
        
      67 
        
      of the prospectus 
       
        
        
     </oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      decimals="0"
      id="ixv-122955"
      unitRef="usd">50000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47486">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="4"
      id="ixv-122956"
      unitRef="pure">0.0575</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="4"
      id="ixv-122957"
      unitRef="pure">0</oef:MaximumCumulativeSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="4"
      id="footnoteAMRI-PROS000079155SHF_AC000240065"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:MaximumDeferredSalesChargeOverOther
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="4"
      id="ixv-122959"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOther>
    <oef:ExpensesDeferredChargesTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47549"> 
        
      Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%. 
        
     </oef:ExpensesDeferredChargesTextBlock>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47554">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="6"
      id="ixv-122960"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="6"
      id="ixv-122961"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="6"
      id="ixv-122962"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="6"
      id="ixv-122963"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="6"
      id="ixv-122964"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="6"
      id="ixv-122965"
      unitRef="pure">0.0000</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="6"
      id="ixv-122966"
      unitRef="pure">0.0073</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="6"
      id="ixv-122967"
      unitRef="pure">0.0048</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47633">
     
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="0"
      id="ixv-122968"
      unitRef="usd">645</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="0"
      id="ixv-122969"
      unitRef="usd">49</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="0"
      id="ixv-122970"
      unitRef="usd">795</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="0"
      id="ixv-122971"
      unitRef="usd">154</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="0"
      id="ixv-122972"
      unitRef="usd">958</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="0"
      id="ixv-122973"
      unitRef="usd">269</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000079155_Cid_C000240065"
      decimals="0"
      id="ixv-122974"
      unitRef="usd">1429</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000079155_Cid_C000240064"
      decimals="0"
      id="ixv-122975"
      unitRef="usd">604</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47718">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47723">
     
       
     The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity 
       
     &#xae; 
       
     funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       54 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122976"
      unitRef="pure">0.54</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47736">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-47741">
     
       
      
       
        Investing primarily in a combination of Fidelity&#xae; U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity&#xae;&#160;funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. 
      Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management &amp; Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. 
      
      
       
        
        &#160; 
         
        &#160; 
        &#160; 
        
       
      
      
      The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. 
      Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. 
      The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. 
      As of August 1,  
        2025, the fund's neutral asset allocation to underlying Fidelity&#xae; funds and futures was approximately: 
      
      
       
        
         
           
         U.S. Equity Funds  
            29% 
         
         
           
         International Equity Funds  
            19% 
         
         
           
         International Bond Funds 5% 
         
         
           
         U.S. Investment Grade Bond Funds 30% 
         
         
           
         Long-Term Treasury Bond Funds 4% 
         
         
           
         Long-Term Inflation-Protected Bond Funds 8% 
         
         
           
         Short-Term Inflation-Protected Bond Funds  
            2% 
         
         
           
         Short-Term Funds 3% 
         
        
       
      
     &#160; 
      
       
        
        &#160; 
         
        &#160; 
        
       
      
     * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. 
      
      The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. 
      The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. 
      Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. 
      
     The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. 
     When the neutral asset allocation of a fund matches Fidelity&#160;Managed Retirement Income Fund's neutral asset allocation&#160;(approximately 10 to 20 years after the year indicated in the fund's&#160;name), the Board of Trustees may combine the fund with Fidelity&#160;Managed Retirement Income Fund SM , without shareholder approval,&#160;and the fund's shareholders will become shareholders of Fidelity&#160;Managed Retirement Income Fund SM . 
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_AssetAllocationRiskMember"
      id="ixv-47905">
     
       
      
      Asset Allocation Risk. 
      
     The fund is subject to risks resulting from the Adviser's asset allocation decisions. If the Adviser's asset allocation strategy does not work as intended, the fund may not achieve its objective. If the fund is unable to achieve its objective, the payment strategy may not work as intended. The selection of underlying funds and the allocation of the fund's assets among various asset classes could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives. In addition, the fund's active asset allocation strategy may cause the fund to have a risk profile different than that portrayed above from time to time and may increase losses. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_InvestingInOtherFundsMember"
      id="ixv-47914">
     
       
      
      Investing in Other Funds. 
      
     The fund bears all risks of investment strategies employed by the underlying funds, including the risk that the underlying funds will not meet their investment objectives. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_StockMarketVolatilityMember"
      id="ixv-47923">
     
       
      
      Stock Market Volatility. 
      
     The Adviser will continue to invest the fund's assets in equity funds in the years following the fund's horizon date in an effort to achieve the fund's overall investment objective. Stock markets are volatile and can decline significantly in response to adverse issuer, political, regulatory, market, or economic developments. Different parts of the market, including different market sectors, and different types of securities can react differently to these developments. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-47932">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt or money market security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_ForeignExposureMember"
      id="ixv-47941">
     
       
      
      Foreign Exposure. 
      
     Foreign markets, particularly emerging markets, can be more volatile than the U.S. market due to increased risks of adverse issuer, political, regulatory, market, or economic developments and can perform differently from the U.S. market. The extent of economic development; political stability; market depth, infrastructure, and capitalization; and regulatory oversight can be less than in more developed markets. Emerging markets typically have less established legal, accounting and financial reporting systems than those in more developed markets, which may reduce the scope or quality of financial information available to investors. Emerging markets can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile. Foreign exchange rates also can be extremely volatile. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_IndustryExposureMember"
      id="ixv-47950">
     
       
      
      Industry Exposure. 
      
     Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_PrepaymentMember"
      id="ixv-47959">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-47968">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. Changes in the financial condition of an issuer or counterparty (e.g., broker-dealer or other borrower in a securities lending transaction) can increase the risk of default by an issuer or counterparty, which can affect a security's or instrument's value or result in delays in recovering securities and/or capital from a counterparty. A decline in the credit quality of an issuer or a provider of credit support (such as guarantees) or a maturity-shortening structure (such as demand and put features) for a security can cause the price of a security to decrease. 
     Lower-quality debt securities (those of less than investment-grade quality, also referred to as high yield debt securities or junk bonds) including floating rate loans and certain types of other securities involve greater risk of default or price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments and can be difficult to resell. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CorrelationToIndexMember"
      id="ixv-47983">
     
       
      
      Correlation to Index. 
      
     The performance of an underlying index fund and its index may vary somewhat due to factors such as fees and expenses of the underlying fund, transaction costs, sample selection, regulatory restrictions, and timing differences associated with additions to and deletions from the index. Errors in the construction or calculation of the index may occur from time to time and may not be identified and corrected for some period of time, which may have an adverse impact on an underlying fund and its shareholders. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_PassiveManagementRiskMember"
      id="ixv-47992">
     
       
      
      Passive Management Risk. 
      
     Some of the underlying funds in which the fund invests are managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities, regardless of the current or projected performance of an underlying fund's index or of the actual securities included in the index. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the performance of these underlying funds could be lower than actively managed funds that may shift their portfolio assets to take advantage of market opportunities or lessen the impact of a market decline or a decline in the value of one or more issuers. An underlying index fund may be concentrated to approximately the same extent that its index concentrates in the securities of issuers in a particular industry or group of industries. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_LeverageRiskMember"
      id="ixv-48001">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_GrowthInvestingMember"
      id="ixv-48010">
     
       
      
      "Growth" Investing. 
      
     "Growth" stocks can perform differently from the market as a whole and other types of stocks and can be more volatile than other types of stocks. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_ValueInvestingMember"
      id="ixv-48019">
     
       
      
      "Value" Investing. 
      
     "Value" stocks can perform differently from the market as a whole and other types of stocks and can continue to be undervalued by the market for long periods of time. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CommodityLinkedInvestingMember"
      id="ixv-48028">
     
       
      
      Commodity-Linked Investing. 
      
     The value of commodities and commodity-linked investments may be affected by the performance of the overall commodities markets as well as weather, political, tax, and other regulatory and market developments. Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_CommodityFuturesMember"
      id="ixv-48037">
     
       
      
      Commodity Futures. 
      
     Investments in commodity futures contracts are also subject to the risk of the failure of any of the exchanges on which an underlying fund's positions trade or of its clearinghouses or counterparties. In addition, certain commodity exchanges limit fluctuations in certain futures contract prices during a single day by regulations referred to as "daily price fluctuation limits" or "daily limits." Under such daily limits, during a single trading day no trades may be executed at prices beyond the daily limit. If triggered, these limits could prevent the underlying fund from liquidating unfavorable positions and subject the underlying fund to losses or prevent it from entering into desired trades during the particular trading day. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_SecuritiesLendingRiskMember"
      id="ixv-48046">
     
       
      
      Securities Lending Risk. 
      
     Securities lending involves the risk that the borrower may fail to return the securities loaned in a timely manner or at all. If the borrower defaults on its obligation to return the securities loaned because of insolvency or other reasons, an underlying fund could experience delays and costs in recovering the securities loaned or in gaining access to the collateral. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_SecuritizedDebtSecuritiesExposureMember"
      id="ixv-48055">
     
       
      
       
        Securitized Debt Securities Exposure. 
      
     Securitized debt securities are dependent on the cash flows generated by the underlying assets and can be significantly affected by changes in interest rates, the availability of information concerning the underlying assets and their structure, and the creditworthiness of the originators of the loans or other receivables or the entities providing credit support. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-48066">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-48074">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48081">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48086">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
      
       
     The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Visit 
       
      
        
      institutional.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48092"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48099"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48105"> 
        
      institutional.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48110">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:BarChartNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48114">
     
       
      
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
      
       
    
   </oef:BarChartNarrativeTextBlock>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48117"> 
        
      The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown. 
        
     </oef:BarChartDoesNotReflectSalesLoads>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_2023"
      decimals="INF"
      id="ixv-122977"
      unitRef="pure">0.1311</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_2024"
      decimals="INF"
      id="ixv-122978"
      unitRef="pure">0.0751</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48203">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122979"
      unitRef="pure">0.0897</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48213">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48218">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122980"
      unitRef="pure">-0.0385</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48229">2023-09-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48234">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      decimals="4"
      id="ixv-122981"
      unitRef="pure">0.0761</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48244">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48249">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48255">
     
       
      
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
      
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
      
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances.  
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableDoesReflectSalesLoads
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48258"> 
        
      Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. 
        
     </oef:PerformanceTableDoesReflectSalesLoads>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48263"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableOneClassOfAfterTaxShown
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48268"> 
        
      After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. 
        
     </oef:PerformanceTableOneClassOfAfterTaxShown>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48274"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).  
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48278"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240065_ReturnBeforeTaxes_01"
      id="ixv-48304">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122982"
      unitRef="pure">0.0133</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000079155AAR_A_RBT_loc"
      unitRef="pure">0.0594</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributions_01"
      id="ixv-48319">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-122984"
      unitRef="pure">0.0055</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributions_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000079155AAR_A_ATD_loc"
      unitRef="pure">0.0512</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-48332">
          Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-122986"
      unitRef="pure">0.0113</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240065_AfterTaxesOnDistributionsAndSales_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000079155AAR_A_ATDS_loc"
      unitRef="pure">0.0434</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Cid_C000240064_ReturnBeforeTaxes_01"
      id="ixv-48345">
         Return Before Taxes 
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240064_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-122988"
      unitRef="pure">0.0769</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Cid_C000240064_ReturnBeforeTaxes_AverageAnnualReturnSinceInception"
      decimals="4"
      id="footnoteAMRI-PROS000079155AAR_B_RBT_loc"
      unitRef="pure">0.0930</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_AMRI-PRO_01"
      id="ixv-48357">
         Fidelity Managed Retirement 2035 Composite Index&#x2120;
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122990"
      unitRef="pure">0.0833</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_IXUHT_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122991"
      unitRef="pure">0.0959</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_AMRI-PRO_01"
      id="ixv-48376">
         S&amp;P 500&#xae; Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122992"
      unitRef="pure">0.2502</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_SP001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122993"
      unitRef="pure">0.2415</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_AMRI-PRO_01"
      id="ixv-48395">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_AMRI-PRO_01"
      decimals="4"
      id="ixv-122994"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000079155_Indexid_LB001_contentCd_AMRI-PRO_AverageAnnualReturnSinceInception"
      decimals="4"
      id="ixv-122995"
      unitRef="pure">0.0209</oef:AvgAnnlRtrPct>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000079155_Cid_C000240065" id="ixv-48427">2022-12-15</oef:AnnualReturnInceptionDate>
    <oef:AnnualReturnInceptionDate contextRef="Pid_S000079155_Cid_C000240064" id="ixv-48440">2022-12-15</oef:AnnualReturnInceptionDate>
    <oef:PerformanceTableMarketIndexChanged
      contextRef="Pid_S000079155_contentCd_AMRI-PRO"
      id="ixv-48450">
     
       
      
       
     Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&amp;P 500 
       
     &#xae; 
       
     &#160; 
     Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies. 
       
     &#160; 
       
    
   </oef:PerformanceTableMarketIndexChanged>
    <oef:RiskReturnHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62148">
     
       
     Fund Summary 
       
     Fund: 
     Fidelity&#xae; GNMA Fund 
    
   </oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62157">
     
       
     Investment Objective 
       
    
   </oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62162">
     
       
     Fidelity&#xae; GNMA Fund seeks a high level of current income, consistent with prudent investment risk. In seeking current income, the fund may also consider the potential for capital gain. 
       
    
   </oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62167">
     
       
     Fee Table 
       
    
   </oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62173">
     
       
     The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund.  
       You may pay other fees, such as brokerage commissions 
       , which are not reflected in the  
       tables and  
       examples below. 
    
   </oef:ExpenseNarrativeTextBlock>
    <oef:ShareholderFeesCaption
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62194">
     
       
     Shareholder fees 
       
    
   </oef:ShareholderFeesCaption>
    <oef:ShareholderFeeOther
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      decimals="0"
      id="ixv-122996"
      unitRef="usd">0</oef:ShareholderFeeOther>
    <oef:OperatingExpensesCaption
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62209">
     
       
     Annual Operating Expenses 
       
    
   </oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="6"
      id="ixv-122997"
      unitRef="pure">0.0028</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="6"
      id="ixv-122998"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="6"
      id="ixv-122999"
      unitRef="pure">0.0017</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="6"
      id="ixv-123000"
      unitRef="pure">0.0045</oef:ExpensesOverAssets>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62256">
     
       
      
       
     This  
     example 
       
     helps compare the cost of investing in the fund with the cost of investing in other funds. 
       
     Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: 
    
   </oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="0"
      id="ixv-123001"
      unitRef="usd">46</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="0"
      id="ixv-123002"
      unitRef="usd">144</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="0"
      id="ixv-123003"
      unitRef="usd">252</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Pid_S000007068_Cid_C000019282"
      decimals="0"
      id="ixv-123004"
      unitRef="usd">567</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62314">
     
       
     Portfolio Turnover 
       
    
   </oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62319">
     
       
     The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 
       
     
       
       639 
       
       
     % of the average value of its portfolio. 
       
    
   </oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      decimals="4"
      id="ixv-123005"
      unitRef="pure">6.39</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62328">
     
       
     Principal Investment Strategies 
       
    
   </oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62333">
     
       
      
       
        Normally investing at least 80% of assets in Ginnie Maes and repurchase agreements for Ginnie Maes. 
      
     Ginnie Maes are U.S. Government securities&#160; that represent interests in pools of mortgage loans. Their principal and interest payments are fully guaranteed by the U.S. Government. 
     A repurchase agreement is an agreement to buy a security at one price and a simultaneous agreement to sell it back at an agreed-upon price. 
     Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives. 
      
      &#160; 
      Investing in other U.S. Government securities and instruments related to U.S. Government securities. 
      Investing in U.S. Government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury. 
      Managing the fund to have similar overall interest rate risk to the Bloomberg GNMA Index. 
      Allocating assets across different market sectors and maturities. 
      Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments. 
      Engaging in transactions that have a leveraging effect on the fund, including investments in derivatives - such as swaps (interest rate, total return, and credit default), options, and futures contracts - and forward-settling securities, to adjust the fund's risk exposure. 
      
    
   </oef:StrategyNarrativeTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_InterestRateChangesMember"
      id="ixv-62365">
     
       
      
      Interest Rate Changes. 
      
     Interest rate increases can cause the price of a debt security to decrease. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_PrepaymentMember"
      id="ixv-62374">
     
       
      
      Prepayment. 
      
     The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_IssuerSpecificChangesMember"
      id="ixv-62383">
     
       
      
      Issuer-Specific Changes. 
      
     The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_LeverageRiskMember"
      id="ixv-62392">
     
       
      
      Leverage Risk. 
      
     Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. 
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_HighPortfolioTurnoverMember"
      id="ixv-62401">
     
       
      
      High Portfolio Turnover. 
      
     High portfolio turnover (more than 100%) may result in increased transaction costs and potentially higher capital gains or losses. The effects of higher than normal portfolio turnover may adversely affect the fund's performance. 
      
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_RiskNotInsuredDepositoryInstitutionMember"
      id="ixv-62411">
     
       
     An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency 
       
     . 
       
    
   </oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO_RiskMember_RiskLoseMoneyMember"
      id="ixv-62419">
     
       
     &#160; 
       
     You could lose money by investing in the fund. 
       
    
   </oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62428">
     
       
     Performance 
       
    
   </oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62433">
     
       
      
       The following information is intended to help you understand the risks of investing in the fund. 
      
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. 
        
      
       
     The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear 
       
     in the "Additional Index Information" section of the prospectus. 
       
      
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
      
     Visit 
       
      
        
      www.fidelity.com  
      
       
     for more recent performance information. 
    
   </oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62439"> 
        
      The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. 
        
     </oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62448"> 
        
      Past performance (before and after taxes) is not an indication of future performance. 
        
     </oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62454"> 
        
      www.fidelity.com  
     </oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62459">
     
       
     Year-by-Year Returns  
    
   </oef:BarChartHeading>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2015"
      decimals="INF"
      id="ixv-123006"
      unitRef="pure">0.0120</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2016"
      decimals="INF"
      id="ixv-123007"
      unitRef="pure">0.0163</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2017"
      decimals="INF"
      id="ixv-123008"
      unitRef="pure">0.0174</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2018"
      decimals="INF"
      id="ixv-123009"
      unitRef="pure">0.0061</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2019"
      decimals="INF"
      id="ixv-123010"
      unitRef="pure">0.0571</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2020"
      decimals="INF"
      id="ixv-123011"
      unitRef="pure">0.0374</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2021"
      decimals="INF"
      id="ixv-123012"
      unitRef="pure">-0.0085</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2022"
      decimals="INF"
      id="ixv-123013"
      unitRef="pure">-0.1128</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2023"
      decimals="INF"
      id="ixv-123014"
      unitRef="pure">0.0543</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_2024"
      decimals="INF"
      id="ixv-123015"
      unitRef="pure">0.0102</oef:AnnlRtrPct>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62570">
          &#160;&#160;&#160;Highest Quarter Return
        </oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      decimals="4"
      id="ixv-123016"
      unitRef="pure">0.0751</oef:BarChartHighestQuarterlyReturn>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62580">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62585">
          &#160;&#160;&#160;Lowest Quarter Return
        </oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      decimals="4"
      id="ixv-123017"
      unitRef="pure">-0.0497</oef:BarChartLowestQuarterlyReturn>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62596">2022-09-30</oef:BarChartLowestQuarterlyReturnDate>
    <oef:YearToDateReturnLabel
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62601">
          &#160;&#160;&#160;Year-to-Date Return
        </oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturn
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      decimals="4"
      id="ixv-123018"
      unitRef="pure">0.0408</oef:BarChartYearToDateReturn>
    <oef:BarChartYearToDateReturnDate
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62611">2025-06-30</oef:BarChartYearToDateReturnDate>
    <oef:PerformanceTableHeading
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62616">
     
       
     Average Annual Returns 
       
    
   </oef:PerformanceTableHeading>
    <oef:PerformanceTableNarrativeTextBlock
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62621">
     
       
      
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
      
       
     Actual after-tax returns may differ depending on your individual circumstances. 
       
      
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
      
       
      
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
      
       
    
   </oef:PerformanceTableNarrativeTextBlock>
    <oef:PerformanceTableUsesHighestFederalRate
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62624"> 
        
      After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. 
        
     </oef:PerformanceTableUsesHighestFederalRate>
    <oef:PerformanceTableNotRelevantToTaxDeferred
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62631"> 
        
      The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). 
        
     </oef:PerformanceTableNotRelevantToTaxDeferred>
    <oef:PerformanceTableExplanationAfterTaxHigher
      contextRef="Pid_S000007068_contentCd_MOG-PRO"
      id="ixv-62636"> 
        
      Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. 
        
     </oef:PerformanceTableExplanationAfterTaxHigher>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_01"
      id="ixv-62681">
         Return Before Taxes
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_01"
      decimals="4"
      id="ixv-123019"
      unitRef="pure">0.0102</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_05"
      decimals="4"
      id="ixv-123020"
      unitRef="pure">-0.0057</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_ReturnBeforeTaxes_10"
      decimals="4"
      id="ixv-123021"
      unitRef="pure">0.0079</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_01"
      id="ixv-62697">
         Return After Taxes on Distributions
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_01"
      decimals="4"
      id="ixv-123022"
      unitRef="pure">-0.0050</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_05"
      decimals="4"
      id="ixv-123023"
      unitRef="pure">-0.0151</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributions_10"
      decimals="4"
      id="ixv-123024"
      unitRef="pure">-0.0017</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_01"
      id="ixv-62715">
         Return After Taxes on Distributions and Sale of Fund Shares
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_01"
      decimals="4"
      id="ixv-123025"
      unitRef="pure">0.0063</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_05"
      decimals="4"
      id="ixv-123026"
      unitRef="pure">-0.0081</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Cid_C000019282_AfterTaxesOnDistributionsAndSales_10"
      decimals="4"
      id="ixv-123027"
      unitRef="pure">0.0020</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_01"
      id="ixv-62732">
         Bloomberg GNMA Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_01"
      decimals="4"
      id="ixv-123028"
      unitRef="pure">0.0096</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_05"
      decimals="4"
      id="ixv-123029"
      unitRef="pure">-0.0060</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB020_contentCd_MOG-PRO_10"
      decimals="4"
      id="ixv-123030"
      unitRef="pure">0.0085</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_01"
      id="ixv-62758">
         Bloomberg U.S. Aggregate Bond Index
        </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_01"
      decimals="4"
      id="ixv-123031"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_05"
      decimals="4"
      id="ixv-123032"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Pid_S000007068_Indexid_LB001_contentCd_MOG-PRO_10"
      decimals="4"
      id="ixv-123033"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <link:footnoteLink
      xlink:role="http://www.xbrl.org/2003/role/link"
      xlink:type="extended">
        <link:loc
          xlink:href="#footnoteMRI-PROS000066139AAR_A_RBT_loc"
          xlink:label="footnoteMRI-PROS000066139AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-PROS000066139AAR_A" xlink:label="footnoteMRI-PROS000066139AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 16, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000066139AAR_A_RBT_loc"
          xlink:to="footnoteMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-PROS000066139AAR_A_ATD_loc"
          xlink:label="footnoteMRI-PROS000066139AAR_A_ATD_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000066139AAR_A_ATD_loc"
          xlink:to="footnoteMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:label="footnoteMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:to="footnoteMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-PROS000079155AAR_A_RBT_loc"
          xlink:label="footnoteMRI-PROS000079155AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-PROS000079155AAR_A" xlink:label="footnoteMRI-PROS000079155AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">December 15, 2022</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000079155AAR_A_RBT_loc"
          xlink:to="footnoteMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-PROS000079155AAR_A_ATD_loc"
          xlink:label="footnoteMRI-PROS000079155AAR_A_ATD_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000079155AAR_A_ATD_loc"
          xlink:to="footnoteMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:label="footnoteMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:to="footnoteMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000018468AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000018468AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000018468AAR_A" xlink:label="footnoteMRI-K6-PROS000018468AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000018468AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000018468AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000018472AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000018472AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000018472AAR_A" xlink:label="footnoteMRI-K6-PROS000018472AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000018472AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000018472AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000018464AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000018464AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000018464AAR_A" xlink:label="footnoteMRI-K6-PROS000018464AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000018464AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000018464AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000019923AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000019923AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000019923AAR_A" xlink:label="footnoteMRI-K6-PROS000019923AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000019923AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000019923AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000019925AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000019925AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000019925AAR_A" xlink:label="footnoteMRI-K6-PROS000019925AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000019925AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000019925AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000066139AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000066139AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000066139AAR_A" xlink:label="footnoteMRI-K6-PROS000066139AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 16, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000066139AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K6-PROS000079155AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K6-PROS000079155AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K6-PROS000079155AAR_A" xlink:label="footnoteMRI-K6-PROS000079155AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">December 15, 2022</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K6-PROS000079155AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K6-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000018468AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000018468AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000018468AAR_A" xlink:label="footnoteMRI-K-PROS000018468AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000018468AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000018468AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000018472AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000018472AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000018472AAR_A" xlink:label="footnoteMRI-K-PROS000018472AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000018472AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000018472AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000018464AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000018464AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000018464AAR_A" xlink:label="footnoteMRI-K-PROS000018464AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000018464AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000018464AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000019923AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000019923AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000019923AAR_A" xlink:label="footnoteMRI-K-PROS000019923AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000019923AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000019923AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000019925AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000019925AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000019925AAR_A" xlink:label="footnoteMRI-K-PROS000019925AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 1, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000019925AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000019925AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000066139AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000066139AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000066139AAR_A" xlink:label="footnoteMRI-K-PROS000066139AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">August 16, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000066139AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteMRI-K-PROS000079155AAR_A_RBT_loc"
          xlink:label="footnoteMRI-K-PROS000079155AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteMRI-K-PROS000079155AAR_A" xlink:label="footnoteMRI-K-PROS000079155AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">December 15, 2022</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteMRI-K-PROS000079155AAR_A_RBT_loc"
          xlink:to="footnoteMRI-K-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000018468SHF_AC000051091"
          xlink:label="footnoteAMRI-PROS000018468SHF_AC000051091"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000018468SHF_A" xlink:label="footnoteAMRI-PROS000018468SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000018468SHF_AC000051091"
          xlink:to="footnoteAMRI-PROS000018468SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000018472SHF_AC000051111"
          xlink:label="footnoteAMRI-PROS000018472SHF_AC000051111"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000018472SHF_A" xlink:label="footnoteAMRI-PROS000018472SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000018472SHF_AC000051111"
          xlink:to="footnoteAMRI-PROS000018472SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000018464SHF_AC000051071"
          xlink:label="footnoteAMRI-PROS000018464SHF_AC000051071"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000018464SHF_A" xlink:label="footnoteAMRI-PROS000018464SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000018464SHF_AC000051071"
          xlink:to="footnoteAMRI-PROS000018464SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000019923SHF_AC000055913"
          xlink:label="footnoteAMRI-PROS000019923SHF_AC000055913"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000019923SHF_A" xlink:label="footnoteAMRI-PROS000019923SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000019923SHF_AC000055913"
          xlink:to="footnoteAMRI-PROS000019923SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000019925SHF_AC000055923"
          xlink:label="footnoteAMRI-PROS000019925SHF_AC000055923"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000019925SHF_A" xlink:label="footnoteAMRI-PROS000019925SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000019925SHF_AC000055923"
          xlink:to="footnoteAMRI-PROS000019925SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000066139SHF_AC000213721"
          xlink:label="footnoteAMRI-PROS000066139SHF_AC000213721"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000066139SHF_A" xlink:label="footnoteAMRI-PROS000066139SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000066139SHF_AC000213721"
          xlink:to="footnoteAMRI-PROS000066139SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000066139AAR_A_RBT_loc"
          xlink:label="footnoteAMRI-PROS000066139AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000066139AAR_A" xlink:label="footnoteAMRI-PROS000066139AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:4.5pt; vertical-align:3pt; ">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">August 16, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000066139AAR_A_RBT_loc"
          xlink:to="footnoteAMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000066139AAR_A_ATD_loc"
          xlink:label="footnoteAMRI-PROS000066139AAR_A_ATD_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000066139AAR_A_ATD_loc"
          xlink:to="footnoteAMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:label="footnoteAMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000066139AAR_A_ATDS_loc"
          xlink:to="footnoteAMRI-PROS000066139AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000066139AAR_B_RBT_loc"
          xlink:label="footnoteAMRI-PROS000066139AAR_B_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000066139AAR_B" xlink:label="footnoteAMRI-PROS000066139AAR_B" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:4.5pt; vertical-align:3pt; ">B</xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">August 16, 2019</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000066139AAR_B_RBT_loc"
          xlink:to="footnoteAMRI-PROS000066139AAR_B"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000079155SHF_AC000240065"
          xlink:label="footnoteAMRI-PROS000079155SHF_AC000240065"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000079155SHF_A" xlink:label="footnoteAMRI-PROS000079155SHF_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:4.67pt; vertical-align:super">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span style="font-family:Arial; font-size:8.5pt; font-style:italic">Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000079155SHF_AC000240065"
          xlink:to="footnoteAMRI-PROS000079155SHF_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000079155AAR_A_RBT_loc"
          xlink:label="footnoteAMRI-PROS000079155AAR_A_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000079155AAR_A" xlink:label="footnoteAMRI-PROS000079155AAR_A" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:4.5pt; vertical-align:3pt; ">A</xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">December 15, 2022</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000079155AAR_A_RBT_loc"
          xlink:to="footnoteAMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000079155AAR_A_ATD_loc"
          xlink:label="footnoteAMRI-PROS000079155AAR_A_ATD_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000079155AAR_A_ATD_loc"
          xlink:to="footnoteAMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:label="footnoteAMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:type="locator"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000079155AAR_A_ATDS_loc"
          xlink:to="footnoteAMRI-PROS000079155AAR_A"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#footnoteAMRI-PROS000079155AAR_B_RBT_loc"
          xlink:label="footnoteAMRI-PROS000079155AAR_B_RBT_loc"
          xlink:type="locator"/>
        <link:footnote id="footnoteAMRI-PROS000079155AAR_B" xlink:label="footnoteAMRI-PROS000079155AAR_B" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:div style="padding:2px"><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:4.5pt; vertical-align:3pt; ">B</xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">From </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">December 15, 2022</xhtml:span><xhtml:span> </xhtml:span><xhtml:span> </xhtml:span><xhtml:span
      class="redlineClass"
      style="font-family:Arial; font-size:8.5pt; font-style:italic; ">.</xhtml:span><xhtml:span> </xhtml:span></xhtml:div></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="footnoteAMRI-PROS000079155AAR_B_RBT_loc"
          xlink:to="footnoteAMRI-PROS000079155AAR_B"
          xlink:type="arc"/>
    </link:footnoteLink>
</xbrl>
