v3.25.2
Risk/Return Detail Data - FidelityManagedRetirementFunds-AIComboPRO - USD ($)
 12 Months Ended 36 Months Ended 60 Months Ended 72 Months Ended 120 Months Ended
Sep. 29, 2025
Sep. 29, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 29, 2025
Sep. 29, 2025
Sep. 29, 2025
Sep. 29, 2025
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | Fidelity Managed Retirement Income Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.25%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.25%                              
Expense Example, with Redemption, 1 Year $ 26                              
Expense Example, with Redemption, 3 Years 80                              
Expense Example, with Redemption, 5 Years 141                              
Expense Example, with Redemption, 10 Years $ 318                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   4.50%                       2.33% 2.74% [1]  
Annual Return [Percent]     4.50% 8.27% (11.49%) 2.97% 8.79%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement Income Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement Income Fund℠ seeks high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 52 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 52.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. Allocating assets among underlying Fidelity® funds and futures according to a stable neutral asset allocation of approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information.                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.67%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 6.52%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.08%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | IXZNC                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement Income Composite Index℠                            
Average Annual Return, Percent   5.00%                       2.56% 2.89%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement Income Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | Fidelity Managed Retirement 2010 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.25%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.25%                              
Expense Example, with Redemption, 1 Year $ 26                              
Expense Example, with Redemption, 3 Years 80                              
Expense Example, with Redemption, 5 Years 141                              
Expense Example, with Redemption, 10 Years $ 318                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   4.68%                       2.68% 3.21% [2]  
Annual Return [Percent]     4.68% 8.75% (12.23%) 4.03% 9.80%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2010 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2010 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.70%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 7.23%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.76%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2010 Fund | IXZNG                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2010 Composite Index℠                            
Average Annual Return, Percent   5.18%                       2.87% 3.31%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | Fidelity Managed Retirement 2015 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.26%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.26%                              
Expense Example, with Redemption, 1 Year $ 27                              
Expense Example, with Redemption, 3 Years 84                              
Expense Example, with Redemption, 5 Years 146                              
Expense Example, with Redemption, 10 Years $ 331                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   5.39%                       3.30% 3.93% [3]  
Annual Return [Percent]     5.39% 9.84% (13.34%) 5.52% 11.11%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2015 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2015 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 40 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 40.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 15% International Equity Funds 10% International Bond Funds 5% U.S. Investment Grade Bond Funds 40% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 2% Short-Term Inflation-Protected Bond Funds 16% Short-Term Funds 8%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.21%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 8.80%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (7.84%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2015 Fund | IXZNI                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2015 Composite Index℠                            
Average Annual Return, Percent   5.87%                       3.44% 3.96%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | Fidelity Managed Retirement 2020 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.27%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.27%                              
Expense Example, with Redemption, 1 Year $ 28                              
Expense Example, with Redemption, 3 Years 87                              
Expense Example, with Redemption, 5 Years 152                              
Expense Example, with Redemption, 10 Years $ 343                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   6.07%                       3.87% 4.60% [4]  
Annual Return [Percent]     6.07% 10.94% (14.47%) 6.97% 12.30%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2020 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2020 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 39.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 19% International Equity Funds 13% International Bond Funds 5% U.S. Investment Grade Bond Funds 38% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 4% Short-Term Inflation-Protected Bond Funds 12% Short-Term Funds 6%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.72%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 10.31%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (9.77%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2020 Fund | IXZNK                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2020 Composite Index℠                            
Average Annual Return, Percent   6.55%                       3.98% 4.59%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | Fidelity Managed Retirement 2025 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.27%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.27%                              
Expense Example, with Redemption, 1 Year $ 28                              
Expense Example, with Redemption, 3 Years 87                              
Expense Example, with Redemption, 5 Years 152                              
Expense Example, with Redemption, 10 Years $ 343                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   6.78%                       4.39% 5.20% [5]  
Annual Return [Percent]     6.78% 12.05% (15.49%) 8.20% 13.31%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2025 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2025 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 45 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 45.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 23% International Equity Funds 15% International Bond Funds 5% U.S. Investment Grade Bond Funds 35% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 6% Short-Term Inflation-Protected Bond Funds 8% Short-Term Funds 4%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.20%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 11.48%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (11.21%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2025 Fund | IXZNL                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2025 Composite Index℠                            
Average Annual Return, Percent   7.24%                       4.46% 5.12%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | Fidelity Managed Retirement 2030 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.28%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.28%                              
Expense Example, with Redemption, 1 Year $ 29                              
Expense Example, with Redemption, 3 Years 90                              
Expense Example, with Redemption, 5 Years 157                              
Expense Example, with Redemption, 10 Years $ 356                              
Annual Return, Inception Date Aug. 16, 2019                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   7.33%                       4.79% 5.88% [6]  
Annual Return [Percent]     7.33% 12.86% (16.19%) 9.10% 14.07%                  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2030 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2030 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 26% International Equity Funds 18% International Bond Funds 5% U.S. Investment Grade Bond Funds 33% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 7% Short-Term Inflation-Protected Bond Funds 5% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.57%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 12.47%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (12.40%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.31%)  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2030 Fund | IXXRV                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2030 Composite Index℠                            
Average Annual Return, Percent   7.79%                       4.84% 5.74%  
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | Fidelity Managed Retirement 2035 Fund - Class K6                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.28%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.28%                              
Expense Example, with Redemption, 1 Year $ 29                              
Expense Example, with Redemption, 3 Years 90                              
Expense Example, with Redemption, 5 Years 157                              
Expense Example, with Redemption, 10 Years $ 356                              
Annual Return, Inception Date Dec. 15, 2022                              
Average Annual Return, Label [Optional Text]   Class K6                            
Average Annual Return, Percent   8.03%                     9.55% [7]      
Annual Return [Percent]     8.03% 13.51%                        
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2035 Fund℠ /K6                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2035 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 54 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 54.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 29% International Equity Funds 19% International Bond Funds 5% U.S. Investment Grade Bond Funds 30% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 8% Short-Term Inflation-Protected Bond Funds 2% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.86%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 9.06%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Sep. 30, 2023                              
Lowest Quarterly Return (3.73%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Market Index Changed Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&P 500 ®   Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies.                                
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                     2.09%      
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | IXUHT                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2035 Composite Index℠                            
Average Annual Return, Percent   8.33%                     9.59%      
FidelityManagedRetirementFunds-K6ComboPRO | Fidelity Managed Retirement 2035 Fund | SP001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   S&P 500® Index                            
Average Annual Return, Percent   25.02%                     24.15%      
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.45%                              
Expense Example, with Redemption, 1 Year $ 46                              
Expense Example, with Redemption, 3 Years 144                              
Expense Example, with Redemption, 5 Years 252                              
Expense Example, with Redemption, 10 Years $ 567                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   4.29%                       2.12%   3.09%
Annual Return [Percent]     4.29% 8.07% (11.67%) 2.76% 8.56% 10.57% (1.80%) 7.08% 5.23% (0.27%)        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement Income Fund℠ /Fidelity Managed Retirement Income Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement Income Fund℠ seeks high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 52 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 52.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. Allocating assets among underlying Fidelity® funds and futures according to a stable neutral asset allocation of approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information.                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.57%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 6.46%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.13%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | After Taxes on Distributions | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   3.12%                       0.94%   1.88%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   2.63%                       1.21%   1.99%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | IXZNC                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement Income Composite Index℠                            
Average Annual Return, Percent   5.00%                       2.56%   3.42%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement Income Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.45%                              
Expense Example, with Redemption, 1 Year $ 46                              
Expense Example, with Redemption, 3 Years 144                              
Expense Example, with Redemption, 5 Years 252                              
Expense Example, with Redemption, 10 Years $ 567                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   4.48%                       2.48%   3.86%
Annual Return [Percent]     4.48% 8.52% (12.40%) 3.81% 9.58% 12.62% (2.84%) 10.62% 6.86% (0.13%)        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2010 Fund℠ /Fidelity Managed Retirement 2010 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2010 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.58%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 7.16%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.80%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   3.35%                       1.13%   2.30%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   2.76%                       1.49%   2.57%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2010 Fund | IXZNG                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2010 Composite Index℠                            
Average Annual Return, Percent   5.18%                       2.87%   4.20%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.46%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.46%                              
Expense Example, with Redemption, 1 Year $ 47                              
Expense Example, with Redemption, 3 Years 148                              
Expense Example, with Redemption, 5 Years 258                              
Expense Example, with Redemption, 10 Years $ 579                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   5.17%                       3.09%   4.40%
Annual Return [Percent]     5.17% 9.63% (13.53%) 5.32% 10.87% 14.46% (3.69%) 12.06% 7.03% (0.06%)        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2015 Fund℠ /Fidelity Managed Retirement 2015 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2015 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 40 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 40.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 15% International Equity Funds 10% International Bond Funds 5% U.S. Investment Grade Bond Funds 40% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 2% Short-Term Inflation-Protected Bond Funds 16% Short-Term Funds 8%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.11%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 8.75%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (7.90%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   4.07%                       1.80%   2.71%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   3.18%                       1.98%   2.98%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2015 Fund | IXZNI                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2015 Composite Index℠                            
Average Annual Return, Percent   5.87%                       3.44%   4.74%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.47%                              
Expense Example, with Redemption, 1 Year $ 48                              
Expense Example, with Redemption, 3 Years 151                              
Expense Example, with Redemption, 5 Years 263                              
Expense Example, with Redemption, 10 Years $ 591                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   5.86%                       3.66%   4.89%
Annual Return [Percent]     5.86% 10.72% (14.63%) 6.77% 12.05% 16.19% (4.45%) 13.30% 7.07% 0.03%        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2020 Fund℠ /Fidelity Managed Retirement 2020 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2020 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 39.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 19% International Equity Funds 13% International Bond Funds 5% U.S. Investment Grade Bond Funds 38% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 4% Short-Term Inflation-Protected Bond Funds 12% Short-Term Funds 6%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.59%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 10.24%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (9.82%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   4.83%                       2.48%   3.23%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   3.60%                       2.45%   3.38%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2020 Fund | IXZNK                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2020 Composite Index℠                            
Average Annual Return, Percent   6.55%                       3.98%   5.23%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.47%                              
Expense Example, with Redemption, 1 Year $ 48                              
Expense Example, with Redemption, 3 Years 151                              
Expense Example, with Redemption, 5 Years 263                              
Expense Example, with Redemption, 10 Years $ 591                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   6.57%                       4.18%   5.31%
Annual Return [Percent]     6.57% 11.83% (15.67%) 7.99% 13.09% 17.52% (5.08%) 14.24% 7.13% 0.10%        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2025 Fund℠ /Fidelity Managed Retirement 2025 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2025 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 45 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 45.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 23% International Equity Funds 15% International Bond Funds 5% U.S. Investment Grade Bond Funds 35% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 6% Short-Term Inflation-Protected Bond Funds 8% Short-Term Funds 4%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.10%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 11.43%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (11.25%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   5.62%                       2.97%   3.61%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   4.05%                       2.88%   3.71%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2025 Fund | IXZNL                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2025 Composite Index℠                            
Average Annual Return, Percent   7.24%                       4.46%   5.64%
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.48%                              
Expense Example, with Redemption, 1 Year $ 49                              
Expense Example, with Redemption, 3 Years 154                              
Expense Example, with Redemption, 5 Years 269                              
Expense Example, with Redemption, 10 Years $ 604                              
Annual Return, Inception Date Aug. 16, 2019                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   7.20%                       4.59% 5.67% [8]  
Annual Return [Percent]     7.20% 12.51% (16.28%) 8.89% 13.82%                  
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2030 Fund℠ /Fidelity Managed Retirement 2030 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2030 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 26% International Equity Funds 18% International Bond Funds 5% U.S. Investment Grade Bond Funds 33% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 7% Short-Term Inflation-Protected Bond Funds 5% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.41%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 12.44%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (12.43%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   6.33%                       3.47% 4.52% [8]  
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   4.47%                       3.22% 4.07% [8]  
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.31%)  
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2030 Fund | IXXRV                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2030 Composite Index℠                            
Average Annual Return, Percent   7.79%                       4.84% 5.74%  
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.48%                              
Expense Example, with Redemption, 1 Year $ 49                              
Expense Example, with Redemption, 3 Years 154                              
Expense Example, with Redemption, 5 Years 269                              
Expense Example, with Redemption, 10 Years $ 604                              
Annual Return, Inception Date Dec. 15, 2022                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   7.73%                     9.31% [9]      
Annual Return [Percent]     7.73% 13.43%                        
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2035 Fund℠ /Fidelity Managed Retirement 2035 Fund℠                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2035 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 54 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 54.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 29% International Equity Funds 19% International Bond Funds 5% U.S. Investment Grade Bond Funds 30% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 8% Short-Term Inflation-Protected Bond Funds 2% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.80%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 9.08%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Sep. 30, 2023                              
Lowest Quarterly Return (3.79%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Market Index Changed Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&P 500 ®   Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies.                                
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | After Taxes on Distributions | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   6.76%                     8.33% [9]      
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | After Taxes on Distributions and Sales | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   4.91%                     6.88% [9]      
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                     2.09%      
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | IXUHT                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2035 Composite Index℠                            
Average Annual Return, Percent   8.33%                     9.59%      
FidelityManagedRetirementFunds-RetailComboPRO | Fidelity Managed Retirement 2035 Fund | SP001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   S&P 500® Index                            
Average Annual Return, Percent   25.02%                     24.15%      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | Fidelity Advisor Managed Retirement Income Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [10] 0.00%                              
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.70%                              
Expense Example, with Redemption, 1 Year $ 642                              
Expense Example, with Redemption, 3 Years 786                              
Expense Example, with Redemption, 5 Years 942                              
Expense Example, with Redemption, 10 Years $ 1,395                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   (1.95%)                       0.67%   2.22%
Annual Return [Percent]     4.04% 7.80% (11.88%) 2.51% 8.30% 10.28% (2.05%) 6.82% 4.98% (0.52%)        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | Fidelity Advisor Managed Retirement Income Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.45%                              
Expense Example, with Redemption, 1 Year $ 46                              
Expense Example, with Redemption, 3 Years 144                              
Expense Example, with Redemption, 5 Years 252                              
Expense Example, with Redemption, 10 Years $ 567                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   4.30%                       2.13%   3.09%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement Income Fund℠ /Fidelity Advisor Managed Retirement Income Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement Income Fund℠ seeks high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 52 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 52.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. Allocating assets among underlying Fidelity® funds and futures according to a stable neutral asset allocation of approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information.                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.43%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 6.41%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.19%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement Income Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (2.95%)                       (0.39%)   1.14%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement Income Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   (1.06%)                       0.15%   1.36%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | IXZNC                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement Income Composite Index℠                            
Average Annual Return, Percent   5.00%                       2.56%   3.42%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement Income Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | Fidelity Advisor Managed Retirement 2010 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [11] 0.00%                              
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.70%                              
Expense Example, with Redemption, 1 Year $ 642                              
Expense Example, with Redemption, 3 Years 786                              
Expense Example, with Redemption, 5 Years 942                              
Expense Example, with Redemption, 10 Years $ 1,395                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   (1.78%)                       1.01%   2.98%
Annual Return [Percent]     4.21% 8.24% (12.61%) 3.56% 9.31% 12.33% (3.07%) 10.33% 6.61% (0.38%)        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | Fidelity Advisor Managed Retirement 2010 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.45%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.45%                              
Expense Example, with Redemption, 1 Year $ 46                              
Expense Example, with Redemption, 3 Years 144                              
Expense Example, with Redemption, 5 Years 252                              
Expense Example, with Redemption, 10 Years $ 567                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   4.48%                       2.47%   3.86%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2010 Fund℠ /Fidelity Advisor Managed Retirement 2010 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2010 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.46%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 7.11%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.87%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2010 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (2.76%)                       (0.21%)   1.55%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2010 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   (0.96%)                       0.42%   1.93%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2010 Fund | IXZNG                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2010 Composite Index℠                            
Average Annual Return, Percent   5.18%                       2.87%   4.20%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | Fidelity Advisor Managed Retirement 2015 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [12] 0.00%                              
Management Fees (as a percentage of Assets) 0.46%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.71%                              
Expense Example, with Redemption, 1 Year $ 643                              
Expense Example, with Redemption, 3 Years 789                              
Expense Example, with Redemption, 5 Years 947                              
Expense Example, with Redemption, 10 Years $ 1,407                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   (1.12%)                       1.62%   3.53%
Annual Return [Percent]     4.92% 9.37% (13.75%) 5.06% 10.61% 14.14% (3.90%) 11.76% 6.77% (0.31%)        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | Fidelity Advisor Managed Retirement 2015 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.46%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.46%                              
Expense Example, with Redemption, 1 Year $ 47                              
Expense Example, with Redemption, 3 Years 148                              
Expense Example, with Redemption, 5 Years 258                              
Expense Example, with Redemption, 10 Years $ 579                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   5.18%                       3.09%   4.40%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2015 Fund℠ /Fidelity Advisor Managed Retirement 2015 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2015 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 40 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 40.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 15% International Equity Funds 10% International Bond Funds 5% U.S. Investment Grade Bond Funds 40% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 2% Short-Term Inflation-Protected Bond Funds 16% Short-Term Funds 8%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.97%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 8.67%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (7.94%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2015 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (2.05%)                       0.46%   1.96%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2015 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   (0.55%)                       0.90%   2.34%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2015 Fund | IXZNI                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2015 Composite Index℠                            
Average Annual Return, Percent   5.87%                       3.44%   4.74%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | Fidelity Advisor Managed Retirement 2020 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [13] 0.00%                              
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.72%                              
Expense Example, with Redemption, 1 Year $ 644                              
Expense Example, with Redemption, 3 Years 792                              
Expense Example, with Redemption, 5 Years 953                              
Expense Example, with Redemption, 10 Years $ 1,418                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   (0.47%)                       2.18%   4.01%
Annual Return [Percent]     5.60% 10.44% (14.85%) 6.49% 11.78% 15.89% (4.69%) 13.01% 6.80% (0.24%)        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | Fidelity Advisor Managed Retirement 2020 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.47%                              
Expense Example, with Redemption, 1 Year $ 48                              
Expense Example, with Redemption, 3 Years 151                              
Expense Example, with Redemption, 5 Years 263                              
Expense Example, with Redemption, 10 Years $ 591                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   5.86%                       3.66%   4.89%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2020 Fund℠ /Fidelity Advisor Managed Retirement 2020 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2020 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 39.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 19% International Equity Funds 13% International Bond Funds 5% U.S. Investment Grade Bond Funds 38% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 4% Short-Term Inflation-Protected Bond Funds 12% Short-Term Funds 6%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.47%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 10.20%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (9.88%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2020 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (1.32%)                       1.12%   2.47%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2020 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   (0.14%)                       1.36%   2.72%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2020 Fund | IXZNK                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2020 Composite Index℠                            
Average Annual Return, Percent   6.55%                       3.98%   5.23%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | Fidelity Advisor Managed Retirement 2025 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [14] 0.00%                              
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.72%                              
Expense Example, with Redemption, 1 Year $ 644                              
Expense Example, with Redemption, 3 Years 792                              
Expense Example, with Redemption, 5 Years 953                              
Expense Example, with Redemption, 10 Years $ 1,418                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   0.19%                       2.70%   4.42%
Annual Return [Percent]     6.30% 11.55% (15.88%) 7.72% 12.79% 17.23% (5.30%) 13.94% 6.84% (0.15%)        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | Fidelity Advisor Managed Retirement 2025 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.47%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.47%                              
Expense Example, with Redemption, 1 Year $ 48                              
Expense Example, with Redemption, 3 Years 151                              
Expense Example, with Redemption, 5 Years 263                              
Expense Example, with Redemption, 10 Years $ 591                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   6.55%                       4.18%   5.31%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2025 Fund℠ /Fidelity Advisor Managed Retirement 2025 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2025 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 45 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 45.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 23% International Equity Funds 15% International Bond Funds 5% U.S. Investment Grade Bond Funds 35% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 6% Short-Term Inflation-Protected Bond Funds 8% Short-Term Funds 4%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Prior to June 1, 2017, the fund operated under certain different investment policies and a different pricing structure. The fund's historical performance prior to June 1, 2017 may not represent its current investment policies and does not reflect the fund's current pricing structure. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.96%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 11.36%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (11.30%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2025 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (0.61%)                       1.59%   2.84%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2025 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   0.26%                       1.76%   3.05%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2025 Fund | IXZNL                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2025 Composite Index℠                            
Average Annual Return, Percent   7.24%                       4.46%   5.64%
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | Fidelity Advisor Managed Retirement 2030 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [15] 0.00%                              
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.73%                              
Expense Example, with Redemption, 1 Year $ 645                              
Expense Example, with Redemption, 3 Years 795                              
Expense Example, with Redemption, 5 Years 958                              
Expense Example, with Redemption, 10 Years $ 1,429                              
Annual Return, Inception Date Aug. 16, 2019                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   0.74%                       3.09% 4.25% [16]  
Annual Return [Percent]     6.88% 12.28% (16.48%) 8.54% 13.55%                  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | Fidelity Advisor Managed Retirement 2030 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.48%                              
Expense Example, with Redemption, 1 Year $ 49                              
Expense Example, with Redemption, 3 Years 154                              
Expense Example, with Redemption, 5 Years 269                              
Expense Example, with Redemption, 10 Years $ 604                              
Annual Return, Inception Date Aug. 16, 2019                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   7.09%                       4.58% 5.66% [17]  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2030 Fund℠ /Fidelity Advisor Managed Retirement 2030 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2030 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 26% International Equity Funds 18% International Bond Funds 5% U.S. Investment Grade Bond Funds 33% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 7% Short-Term Inflation-Protected Bond Funds 5% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.32%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 12.36%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (12.46%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2030 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   0.03%                       2.08% 3.21% [16]  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2030 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   0.65%                       2.09% 2.99% [16]  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.31%)  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2030 Fund | IXXRV                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2030 Composite Index℠                            
Average Annual Return, Percent   7.79%                       4.84% 5.74%  
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | Fidelity Advisor Managed Retirement 2035 Fund - Class A                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 5.75%                              
Maximum Deferred Sales Charge (as a percentage) [18] 0.00%                              
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.25%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.73%                              
Expense Example, with Redemption, 1 Year $ 645                              
Expense Example, with Redemption, 3 Years 795                              
Expense Example, with Redemption, 5 Years 958                              
Expense Example, with Redemption, 10 Years $ 1,429                              
Annual Return, Inception Date Dec. 15, 2022                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   1.33%                     5.94% [19]      
Annual Return [Percent]     7.51% 13.11%                        
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | Fidelity Advisor Managed Retirement 2035 Fund - Class I                                
Prospectus Line Items                                
Maximum Cumulative Sales Charge (as a percentage of Offering Price) 0.00%                              
Maximum Deferred Sales Charge (as a percentage) 0.00%                              
Management Fees (as a percentage of Assets) 0.48%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.48%                              
Expense Example, with Redemption, 1 Year $ 49                              
Expense Example, with Redemption, 3 Years 154                              
Expense Example, with Redemption, 5 Years 269                              
Expense Example, with Redemption, 10 Years $ 604                              
Annual Return, Inception Date Dec. 15, 2022                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   7.69%                     9.30% [20]      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2035 Fund℠ /Fidelity Advisor Managed Retirement 2035 Fund℠ A, I                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2035 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus and in the sales charge waiver appendix to the prospectus.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 54 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 54.00%                              
Expenses Deferred Charges [Text Block] Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.                              
Expense Breakpoint Discounts [Text] You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $ 50,000 in the fund or certain other Fidelity ® funds. More information about these and other discounts is available from your investment professional and in the "Fund Distribution" section beginning on page 67 of the prospectus                              
Expense Breakpoint, Minimum Investment Required [Amount] $ 50,000                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 29% International Equity Funds 19% International Bond Funds 5% U.S. Investment Grade Bond Funds 30% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 8% Short-Term Inflation-Protected Bond Funds 2% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit institutional.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time.                              
Performance Availability Website Address [Text] institutional.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Bar Chart Narrative [Text Block] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Bar Chart Does Not Reflect Sales Loads [Text] The returns in the bar chart do not reflect any applicable sales charges; if sales charges were reflected, returns would be lower than those shown.                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.61%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 8.97%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Sep. 30, 2023                              
Lowest Quarterly Return (3.85%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Does Reflect Sales Loads Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges.                              
Performance Table Market Index Changed Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&P 500 ®   Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies.                                
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table One Class of after Tax Shown [Text] After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary.                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative Unlike the returns in the bar chart, the returns in the table reflect the maximum applicable sales charges. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. After-tax returns for Class A are shown in the table below and after-tax returns for other classes will vary. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | After Taxes on Distributions | Fidelity Advisor Managed Retirement 2035 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   0.55%                     5.12% [19]      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | After Taxes on Distributions and Sales | Fidelity Advisor Managed Retirement 2035 Fund - Class A                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   1.13%                     4.34% [19]      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                     2.09%      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | IXUHT                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2035 Composite Index℠                            
Average Annual Return, Percent   8.33%                     9.59%      
FidelityManagedRetirementFunds-AIComboPRO | Fidelity Managed Retirement 2035 Fund | SP001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   S&P 500® Index                            
Average Annual Return, Percent   25.02%                     24.15%      
FidelityGNMAFund-PRO | Fidelity GNMA Fund | Fidelity GNMA Fund                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.28%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.17%                              
Expenses (as a percentage of Assets) 0.45%                              
Expense Example, with Redemption, 1 Year $ 46                              
Expense Example, with Redemption, 3 Years 144                              
Expense Example, with Redemption, 5 Years 252                              
Expense Example, with Redemption, 10 Years $ 567                              
Average Annual Return, Label [Optional Text]   Return Before Taxes                            
Average Annual Return, Percent   1.02%                       (0.57%)   0.79%
Annual Return [Percent]     1.02% 5.43% (11.28%) (0.85%) 3.74% 5.71% 0.61% 1.74% 1.63% 1.20%        
FidelityGNMAFund-PRO | Fidelity GNMA Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund: Fidelity® GNMA Fund                              
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity® GNMA Fund seeks a high level of current income, consistent with prudent investment risk. In seeking current income, the fund may also consider the potential for capital gain.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions , which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 639 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 639.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Normally investing at least 80% of assets in Ginnie Maes and repurchase agreements for Ginnie Maes. Ginnie Maes are U.S. Government securities  that represent interests in pools of mortgage loans. Their principal and interest payments are fully guaranteed by the U.S. Government. A repurchase agreement is an agreement to buy a security at one price and a simultaneous agreement to sell it back at an agreed-upon price. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Investing in other U.S. Government securities and instruments related to U.S. Government securities. Investing in U.S. Government securities issued by entities that are chartered or sponsored by Congress but whose securities are neither issued nor guaranteed by the U.S. Treasury. Managing the fund to have similar overall interest rate risk to the Bloomberg GNMA Index. Allocating assets across different market sectors and maturities. Analyzing the credit quality of the issuer, security-specific features, current and potential future valuation, and trading opportunities to select investments. Engaging in transactions that have a leveraging effect on the fund, including investments in derivatives - such as swaps (interest rate, total return, and credit default), options, and futures contracts - and forward-settling securities, to adjust the fund's risk exposure.                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time. The additional index has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and an additional index over various periods of time.                              
Performance Availability Website Address [Text] www.fidelity.com                              
Performance Past Does Not Indicate Future [Text] Past performance (before and after taxes) is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 4.08%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 7.51%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Sep. 30, 2022                              
Lowest Quarterly Return (4.97%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Uses Highest Federal Rate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes.                              
Performance Table Not Relevant to Tax Deferred The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan).                              
Performance Table Explanation after Tax Higher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
Performance Table Narrative After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares.                              
FidelityGNMAFund-PRO | Fidelity GNMA Fund | After Taxes on Distributions | Fidelity GNMA Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions                            
Average Annual Return, Percent   (0.50%)                       (1.51%)   (0.17%)
FidelityGNMAFund-PRO | Fidelity GNMA Fund | After Taxes on Distributions and Sales | Fidelity GNMA Fund                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Return After Taxes on Distributions and Sale of Fund Shares                            
Average Annual Return, Percent   0.63%                       (0.81%)   0.20%
FidelityGNMAFund-PRO | Fidelity GNMA Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%)   1.35%
FidelityGNMAFund-PRO | Fidelity GNMA Fund | LB020                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg GNMA Index                            
Average Annual Return, Percent   0.96%                       (0.60%)   0.85%
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | Fidelity Managed Retirement Income Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.35%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.35%                              
Expense Example, with Redemption, 1 Year $ 36                              
Expense Example, with Redemption, 3 Years 113                              
Expense Example, with Redemption, 5 Years 197                              
Expense Example, with Redemption, 10 Years $ 443                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   4.40%                       2.22% 2.63% [21]  
Annual Return [Percent]     4.40% 8.17% (11.58%) 2.87% 8.67%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement Income Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement Income Fund℠ seeks high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 52 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 52.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a stable neutral asset allocation strategy (approximately 11% in U.S. equity funds, 8% in international equity funds, 43% in U.S. investment grade bond funds, 5% in international bond funds, 3% in long-term treasury bond funds, 20% in short-term inflation-protected bond funds, and 10% in short-term funds). Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. Allocating assets among underlying Fidelity® funds and futures according to a stable neutral asset allocation of approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information.                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.61%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 6.50%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.10%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | IXZNC                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement Income Composite Index℠                            
Average Annual Return, Percent   5.00%                       2.56% 2.89%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement Income Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | Fidelity Managed Retirement 2010 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.35%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.35%                              
Expense Example, with Redemption, 1 Year $ 36                              
Expense Example, with Redemption, 3 Years 113                              
Expense Example, with Redemption, 5 Years 197                              
Expense Example, with Redemption, 10 Years $ 443                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   4.58%                       2.57% 3.11% [22]  
Annual Return [Percent]     4.58% 8.62% (12.31%) 3.94% 9.67%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2010 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2010 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2010. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 11% International Equity Funds 8% International Bond Funds 5% U.S. Investment Grade Bond Funds 43% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 0% Short-Term Inflation-Protected Bond Funds 20% Short-Term Funds 10%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2010 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 5.65%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 7.20%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (6.78%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2010 Fund | IXZNG                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2010 Composite Index℠                            
Average Annual Return, Percent   5.18%                       2.87% 3.31%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | Fidelity Managed Retirement 2015 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.36%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.36%                              
Expense Example, with Redemption, 1 Year $ 37                              
Expense Example, with Redemption, 3 Years 116                              
Expense Example, with Redemption, 5 Years 202                              
Expense Example, with Redemption, 10 Years $ 456                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   5.30%                       3.19% 3.83% [23]  
Annual Return [Percent]     5.30% 9.72% (13.43%) 5.42% 11.00%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2015 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2015 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 40 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 40.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2015. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 15% International Equity Funds 10% International Bond Funds 5% U.S. Investment Grade Bond Funds 40% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 2% Short-Term Inflation-Protected Bond Funds 16% Short-Term Funds 8%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2015 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.16%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 8.75%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Jun. 30, 2022                              
Lowest Quarterly Return (7.86%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2015 Fund | IXZNI                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2015 Composite Index℠                            
Average Annual Return, Percent   5.87%                       3.44% 3.96%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | Fidelity Managed Retirement 2020 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.37%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.37%                              
Expense Example, with Redemption, 1 Year $ 38                              
Expense Example, with Redemption, 3 Years 119                              
Expense Example, with Redemption, 5 Years 208                              
Expense Example, with Redemption, 10 Years $ 468                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   5.97%                       3.77% 4.50% [24]  
Annual Return [Percent]     5.97% 10.84% (14.56%) 6.86% 12.19%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2020 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2020 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 39 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 39.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2020. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 19% International Equity Funds 13% International Bond Funds 5% U.S. Investment Grade Bond Funds 38% Long-Term Treasury Bond Funds 3% Long-Term Inflation-Protected Bond Funds 4% Short-Term Inflation-Protected Bond Funds 12% Short-Term Funds 6%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2020 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 6.65%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 10.29%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (9.79%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2020 Fund | IXZNK                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2020 Composite Index℠                            
Average Annual Return, Percent   6.55%                       3.98% 4.59%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | Fidelity Managed Retirement 2025 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.37%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.37%                              
Expense Example, with Redemption, 1 Year $ 38                              
Expense Example, with Redemption, 3 Years 119                              
Expense Example, with Redemption, 5 Years 208                              
Expense Example, with Redemption, 10 Years $ 468                              
Annual Return, Inception Date Aug. 01, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   6.67%                       4.29% 5.09% [25]  
Annual Return [Percent]     6.67% 11.94% (15.59%) 8.10% 13.20%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2025 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2025 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 45 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 45.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2025. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 23% International Equity Funds 15% International Bond Funds 5% U.S. Investment Grade Bond Funds 35% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 6% Short-Term Inflation-Protected Bond Funds 8% Short-Term Funds 4%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2025 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.16%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 11.46%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (11.21%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.01%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2025 Fund | IXZNL                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2025 Composite Index℠                            
Average Annual Return, Percent   7.24%                       4.46% 5.12%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | Fidelity Managed Retirement 2030 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.38%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.38%                              
Expense Example, with Redemption, 1 Year $ 39                              
Expense Example, with Redemption, 3 Years 122                              
Expense Example, with Redemption, 5 Years 213                              
Expense Example, with Redemption, 10 Years $ 480                              
Annual Return, Inception Date Aug. 16, 2019                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   7.18%                       4.68% 5.76% [26]  
Annual Return [Percent]     7.18% 12.74% (16.25%) 8.95% 13.97%                  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2030 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2030 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 59 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 59.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2030. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 26% International Equity Funds 18% International Bond Funds 5% U.S. Investment Grade Bond Funds 33% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 7% Short-Term Inflation-Protected Bond Funds 5% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2030 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time. The hypothetical composite of market indexes has characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index and a hypothetical composite of market indexes over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.52%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Jun. 30, 2020                              
Highest Quarterly Return 12.45%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Mar. 31, 2020                              
Lowest Quarterly Return (12.41%)                              
Performance Table Heading Average Annual Returns                              
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                       (0.33%) (0.31%)  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2030 Fund | IXXRV                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2030 Composite Index℠                            
Average Annual Return, Percent   7.79%                       4.84% 5.74%  
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | Fidelity Managed Retirement 2035 Fund - Class K                                
Prospectus Line Items                                
Management Fees (as a percentage of Assets) 0.38%                              
Distribution and Service (12b-1) Fees 0.00%                              
Other Expenses (as a percentage of Assets): 0.00%                              
Expenses (as a percentage of Assets) 0.38%                              
Expense Example, with Redemption, 1 Year $ 39                              
Expense Example, with Redemption, 3 Years 122                              
Expense Example, with Redemption, 5 Years 213                              
Expense Example, with Redemption, 10 Years $ 480                              
Annual Return, Inception Date Dec. 15, 2022                              
Average Annual Return, Label [Optional Text]   Class K                            
Average Annual Return, Percent   7.82%                     9.42% [27]      
Annual Return [Percent]     7.82% 13.46%                        
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund                                
Prospectus Line Items                                
Risk/Return [Heading] Fund Summary Fund /Class: Fidelity Managed Retirement 2035 Fund℠ /K                                
Objective [Heading] Investment Objective                              
Objective, Primary [Text Block] Fidelity Managed Retirement 2035 Fund℠ seeks total return until its horizon date through a combination of current income and capital growth. Thereafter, the fund's objective will be to seek high current income and, as a                              
Objective, Secondary [Text Block] secondary objective, capital appreciation.                              
Expense Heading [Optional Text] Fee Table                              
Expense Narrative [Text Block] The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.                              
Shareholder Fees Caption [Optional Text] Shareholder fees                              
Shareholder Fee, Other $ 0                              
Operating Expenses Caption [Optional Text] Annual Operating Expenses                              
Portfolio Turnover [Heading] Portfolio Turnover                              
Portfolio Turnover [Text Block] The fund will not incur transaction costs, such as commissions, when it buys and sells shares of underlying Fidelity ® funds (or "turns over" its portfolio), but it could incur transaction costs if it were to buy and sell other types of securities directly. If the fund were to buy and sell other types of securities directly, a higher portfolio turnover rate could indicate higher transaction costs and could result in higher taxes when fund shares are held in a taxable account. Such costs, if incurred, would not be reflected in annual operating expenses or in the example and would affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 54 % of the average value of its portfolio.                              
Portfolio Turnover, Rate 54.00%                              
Expense Example Narrative [Text Block] This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated:                              
Strategy [Heading] Principal Investment Strategies                              
Strategy Narrative [Text Block] Investing primarily in a combination of Fidelity® U.S. equity funds, international equity funds, bond funds, and short-term funds (underlying Fidelity® funds) in a manner that supports a withdrawal strategy to provide investors with income in retirement. Allocating assets according to a neutral asset allocation strategy shown in the glide path below that adjusts over time until it reaches an allocation similar to that of the Fidelity Managed Retirement Income FundSM, approximately 10 to 20 years after the year 2035. Fidelity Management & Research Company LLC (FMR) (the Adviser) may modify the fund's neutral asset allocations from time to time when in the interests of shareholders.       The neutral asset allocation shown in the glide path depicts the allocation to U.S. equity funds, international equity funds, bond funds (including U.S. investment grade bond, international bond, short-term inflation-protected bond, long-term inflation-protected bond, and long-term treasury bond), and short-term funds. Buying and selling futures contracts (both long and short positions) in an effort to manage cash flows efficiently, remain fully invested, or facilitate asset allocation. The Adviser, under normal market conditions, will make investments that are consistent with seeking total return for several years beyond the fund's horizon date in an effort to achieve the fund's overall investment objective. As of August 1, 2025, the fund's neutral asset allocation to underlying Fidelity® funds and futures was approximately: U.S. Equity Funds 29% International Equity Funds 19% International Bond Funds 5% U.S. Investment Grade Bond Funds 30% Long-Term Treasury Bond Funds 4% Long-Term Inflation-Protected Bond Funds 8% Short-Term Inflation-Protected Bond Funds 2% Short-Term Funds 3%       * The Adviser may change these percentages over time. As a result of the active asset allocation strategy (discussed below), actual allocations may differ from the neutral allocations above. The allocation percentages may not add to 100% due to rounding. The Adviser, under normal market conditions, will use an active asset allocation strategy to increase or decrease asset class exposures relative to the neutral asset allocations reflected above by up to 10% for equity funds, bond funds and short-term funds to reflect the Adviser's market outlook, which is primarily focused on the intermediate term. The asset allocations in the glide path and pie chart above are referred to as neutral because they do not reflect any decisions made by the Adviser to overweight or underweight an asset class. The Adviser may also make active asset allocations within other asset classes (such as commodities, high yield debt (also referred to as junk bonds), floating rate debt, real estate debt, and emerging markets debt) from 0% to 10% of the fund's total assets individually, but no more than 25% in aggregate within those other asset classes. Such asset classes are not reflected in the neutral asset allocations reflected in the glide path and pie chart above. Emerging markets include countries that have an emerging stock market as defined by MSCI, countries or markets with low- to middle-income economies as classified by the World Bank, and other countries or markets that the Adviser identifies as having similar emerging markets characteristics. Designed for investors at or around age 60 and above who turned or will turn age 70 in or within a few years of 2035 (horizon date) and plan to gradually withdraw the value of their account in the fund over time. The fund's investment objective is intended to support a withdrawal strategy to provide investors with income in retirement. Please contact Fidelity or your investment professional for more information. When the neutral asset allocation of a fund matches Fidelity Managed Retirement Income Fund's neutral asset allocation (approximately 10 to 20 years after the year indicated in the fund's name), the Board of Trustees may combine the fund with Fidelity Managed Retirement Income Fund SM , without shareholder approval, and the fund's shareholders will become shareholders of Fidelity Managed Retirement Income Fund SM .                              
Bar Chart and Performance Table [Heading] Performance                              
Performance Narrative [Text Block] The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time. The hypothetical composite of market indexes and additional index have characteristics relevant to the fund's investment strategies. Index descriptions appear in the "Additional Index Information" section of the prospectus. Past performance is not an indication of future performance. Visit www.401k.com and log in for more recent performance information.                              
Performance Information Illustrates Variability of Returns [Text] The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index, a hypothetical composite of market indexes, and an additional index over various periods of time.                              
Performance Availability Website Address [Text] www.401k.com                              
Performance Past Does Not Indicate Future [Text] Past performance is not an indication of future performance.                              
Bar Chart [Heading] Year-by-Year Returns                              
Year to Date Return, Label [Optional Text]    Year-to-Date Return                              
Bar Chart, Year to Date Return, Date Jun. 30, 2025                              
Bar Chart, Year to Date Return 7.81%                              
Highest Quarterly Return, Label [Optional Text]    Highest Quarter Return                              
Highest Quarterly Return, Date Dec. 31, 2023                              
Highest Quarterly Return 9.10%                              
Lowest Quarterly Return, Label [Optional Text]    Lowest Quarter Return                              
Lowest Quarterly Return, Date Sep. 30, 2023                              
Lowest Quarterly Return (3.77%)                              
Performance Table Heading Average Annual Returns                              
Performance Table Market Index Changed Effective February 2, 2024, the fund began comparing its performance to the Bloomberg U.S. Aggregate Bond Index rather than the S&P 500 ®   Index because the Bloomberg U.S. Aggregate Bond Index conforms more closely to the fund's investment policies.                                
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | LB001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Bloomberg U.S. Aggregate Bond Index                            
Average Annual Return, Percent   1.25%                     2.09%      
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | IXUHT                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   Fidelity Managed Retirement 2035 Composite Index℠                            
Average Annual Return, Percent   8.33%                     9.59%      
FidelityManagedRetirementFunds-KComboPRO | Fidelity Managed Retirement 2035 Fund | SP001                                
Prospectus Line Items                                
Average Annual Return, Label [Optional Text]   S&P 500® Index                            
Average Annual Return, Percent   25.02%                     24.15%      
Document Type 485BPOS                              
Registrant Name Fidelity Income Fund                              
[1]
A From August 1, 2019 .
[2]
A From August 1, 2019 .
[3]
A From August 1, 2019 .
[4]
A From August 1, 2019 .
[5]
A From August 1, 2019 .
[6]
A From August 16, 2019 .
[7]
A From December 15, 2022 .
[8]
A From August 16, 2019 .
[9]
A From December 15, 2022 .
[10]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[11]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[12]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[13]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[14]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[15]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[16]
A From August 16, 2019 .
[17]
B From August 16, 2019 .
[18]
A Class A purchases of $1 million or more will not be subject to a front-end sales charge. Such Class A purchases may be subject, upon redemption, to a contingent deferred sales charge (CDSC) of 1.00%.
[19]
A From December 15, 2022 .
[20]
B From December 15, 2022 .
[21]
A From August 1, 2019 .
[22]
A From August 1, 2019 .
[23]
A From August 1, 2019 .
[24]
A From August 1, 2019 .
[25]
A From August 1, 2019 .
[26]
A From August 16, 2019 .
[27]
A From December 15, 2022 .