Investment Risks |
Sep. 29, 2025 |
|---|---|
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt security to decrease. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | HighPortfolioTurnoverMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityGNMAFund-PRO | Fidelity GNMA Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | InflationProtectedDebtExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Lose Money [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | You could lose money by investing in the fund. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | Risk Not Insured Depository Institution [Member] | |
| Prospectus Line Items | |
| Risk [Text Block] | 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 . |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | LeverageRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Leverage Risk. Leverage can increase market exposure, magnify investment risks, and cause losses to be realized more quickly. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | GrowthInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | InvestingInOtherFundsMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | IndustryExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Industry Exposure. Market conditions, interest rates, and economic, regulatory, or financial developments could significantly affect a single industry or group of related industries. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | AssetAllocationRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | IssuerSpecificChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | StockMarketVolatilityMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityFuturesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | CorrelationToIndexMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | InterestRateChangesMember | |
| Prospectus Line Items | |
| Risk [Text Block] | Interest Rate Changes. Interest rate increases can cause the price of a debt or money market security to decrease. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritizedDebtSecuritiesExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | ValueInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | "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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | SecuritiesLendingRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | CommodityLinkedInvestingMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | ForeignExposureMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | PassiveManagementRiskMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | PrepaymentMember | |
| Prospectus Line Items | |
| Risk [Text Block] | 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. |
| Document Type | 485BPOS |