XML 37 R7.htm IDEA: XBRL DOCUMENT v3.22.2.2
Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2021
Entity Registrant Name dei_EntityRegistrantName Putnam Target Date Funds
Entity Central Index Key dei_EntityCentralIndexKey 0001295293
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Putnam RetirementReady 2065 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2065 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in



 



a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 13%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2065 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 (your fund) 2060 2055 2050 2045 2040 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Performance information will be available after the fund completes a full calendar year of operation.



 
Putnam RetirementReady 2065 Fund | Class A 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.81% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,791
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,043
Putnam RetirementReady 2065 Fund | Class C 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [4]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.81% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,720
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 10,114
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 4,720
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 10,114
Putnam RetirementReady 2065 Fund | Class R 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.96% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.61%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,104
Putnam RetirementReady 2065 Fund | Class R3 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.96% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,523
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,068
Putnam RetirementReady 2065 Fund | Class R4 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.96% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 22.11%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,030
Putnam RetirementReady 2065 Fund | Class R5 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.81% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 21.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,388
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,007
Putnam RetirementReady 2065 Fund | Class R6 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.71% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 21.86%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,354
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,991
Putnam RetirementReady 2065 Fund | Class Y 2065  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.55%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 20.81% [2]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 21.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (21.31%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 4,388
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 10,007
Putnam RetirementReady 2060 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2060 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).



 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2032
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 52%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. The example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2060 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually



 



change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.

Underlying Fund* Year 2065 2060 (your fund) 2055 2050 2045 2040 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.



 



** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.

The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2032 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2032 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.



 



The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially



 



less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.

Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.



 
Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (22.11%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.62%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.
After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2060 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
Since Inception rr_AverageAnnualReturnSinceInception 16.80%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [5]
5 Years rr_AverageAnnualReturnYear05 3.57% [5]
Since Inception rr_AverageAnnualReturnSinceInception 3.31% [5]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class A 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [6]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.17% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.56%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,045
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,619
Annual Return 2016 rr_AnnualReturn2016 6.84%
Annual Return 2017 rr_AnnualReturn2017 20.58%
Annual Return 2018 rr_AnnualReturn2018 (9.80%)
Annual Return 2019 rr_AnnualReturn2019 20.83%
Annual Return 2020 rr_AnnualReturn2020 14.38%
Annual Return 2021 rr_AnnualReturn2021 17.91%
1 Year rr_AverageAnnualReturnYear01 11.13%
5 Years rr_AverageAnnualReturnYear05 10.81%
Since Inception rr_AverageAnnualReturnSinceInception 9.54%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class A 2060 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.07%
5 Years rr_AverageAnnualReturnYear05 8.77%
Since Inception rr_AverageAnnualReturnSinceInception 7.68%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class A 2060 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.98%
5 Years rr_AverageAnnualReturnYear05 7.98%
Since Inception rr_AverageAnnualReturnSinceInception 7.03%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class B 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [9]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.17% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,097
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,754
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 897
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,754
1 Year rr_AverageAnnualReturnYear01 11.96%
5 Years rr_AverageAnnualReturnYear05 11.02%
Since Inception rr_AverageAnnualReturnSinceInception 9.78%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class C 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [10]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.17% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 3.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,754
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 897
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,754
1 Year rr_AverageAnnualReturnYear01 15.95%
5 Years rr_AverageAnnualReturnYear05 11.28%
Since Inception rr_AverageAnnualReturnSinceInception 9.78%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class R 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.32% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 713
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,568
1 Year rr_AverageAnnualReturnYear01 17.32%
5 Years rr_AverageAnnualReturnYear05 11.80%
Since Inception rr_AverageAnnualReturnSinceInception 10.30%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class R3 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.32% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.71%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
1 Year rr_AverageAnnualReturnYear01 17.66% [11]
5 Years rr_AverageAnnualReturnYear05 12.04% [11]
Since Inception rr_AverageAnnualReturnSinceInception 10.51% [11]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class R4 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.32% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.46%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 990
1 Year rr_AverageAnnualReturnYear01 17.98% [12]
5 Years rr_AverageAnnualReturnYear05 12.33% [12]
Since Inception rr_AverageAnnualReturnSinceInception 10.80% [12]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class R5 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.17% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
1 Year rr_AverageAnnualReturnYear01 18.14% [13]
5 Years rr_AverageAnnualReturnYear05 12.48% [13]
Since Inception rr_AverageAnnualReturnSinceInception 10.95% [13]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class R6 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.07% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 307
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 689
1 Year rr_AverageAnnualReturnYear01 18.25% [14]
5 Years rr_AverageAnnualReturnYear05 12.51% [14]
Since Inception rr_AverageAnnualReturnSinceInception 10.96% [14]
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2060 Fund | Class Y 2060  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.54%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.17% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.66%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
1 Year rr_AverageAnnualReturnYear01 18.15%
5 Years rr_AverageAnnualReturnYear05 12.42%
Since Inception rr_AverageAnnualReturnSinceInception 10.89%
Inception Date rr_AverageAnnualReturnInceptionDate Nov. 30, 2015
Putnam RetirementReady 2055 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2055 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 28%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2055 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 (your fund) 2050 2045 2040 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (21.55%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.84%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.09%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2055 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2055 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [15]
5 Years rr_AverageAnnualReturnYear05 3.57% [15]
10 Years rr_AverageAnnualReturnYear10 2.90% [15]
Putnam RetirementReady 2055 Fund | Class A 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [16]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.75%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,230
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,305
Annual Return 2012 rr_AnnualReturn2012 16.11%
Annual Return 2013 rr_AnnualReturn2013 26.50%
Annual Return 2014 rr_AnnualReturn2014 9.19%
Annual Return 2015 rr_AnnualReturn2015 (0.49%)
Annual Return 2016 rr_AnnualReturn2016 6.77%
Annual Return 2017 rr_AnnualReturn2017 20.44%
Annual Return 2018 rr_AnnualReturn2018 (9.76%)
Annual Return 2019 rr_AnnualReturn2019 20.44%
Annual Return 2020 rr_AnnualReturn2020 13.87%
Annual Return 2021 rr_AnnualReturn2021 17.14%
1 Year rr_AverageAnnualReturnYear01 10.40%
5 Years rr_AverageAnnualReturnYear05 10.47%
10 Years rr_AverageAnnualReturnYear10 10.86%
Putnam RetirementReady 2055 Fund | Class A 2055 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 6.72%
5 Years rr_AverageAnnualReturnYear05 8.24%
10 Years rr_AverageAnnualReturnYear10 8.50%
Putnam RetirementReady 2055 Fund | Class A 2055 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 7.55%
5 Years rr_AverageAnnualReturnYear05 7.69%
10 Years rr_AverageAnnualReturnYear10 7.97%
Putnam RetirementReady 2055 Fund | Class B 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [19]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,286
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,441
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,086
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,441
1 Year rr_AverageAnnualReturnYear01 11.30%
5 Years rr_AverageAnnualReturnYear05 10.68%
10 Years rr_AverageAnnualReturnYear10 10.85%
Putnam RetirementReady 2055 Fund | Class C 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [20]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,086
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,441
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,086
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,441
1 Year rr_AverageAnnualReturnYear01 15.29%
5 Years rr_AverageAnnualReturnYear05 10.94%
10 Years rr_AverageAnnualReturnYear10 10.85%
Putnam RetirementReady 2055 Fund | Class R 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.51% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 905
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,267
1 Year rr_AverageAnnualReturnYear01 16.70%
5 Years rr_AverageAnnualReturnYear05 11.47%
10 Years rr_AverageAnnualReturnYear10 11.22%
Putnam RetirementReady 2055 Fund | Class R3 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.51% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.90%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 774
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,000
1 Year rr_AverageAnnualReturnYear01 17.02% [21]
5 Years rr_AverageAnnualReturnYear05 11.73% [21]
10 Years rr_AverageAnnualReturnYear10 11.45% [21]
Putnam RetirementReady 2055 Fund | Class R4 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.51% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 641
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,725
1 Year rr_AverageAnnualReturnYear01 17.26% [22]
5 Years rr_AverageAnnualReturnYear05 11.98% [22]
10 Years rr_AverageAnnualReturnYear10 11.74% [22]
Putnam RetirementReady 2055 Fund | Class R5 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 561
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,557
1 Year rr_AverageAnnualReturnYear01 17.43% [23]
5 Years rr_AverageAnnualReturnYear05 12.17% [23]
10 Years rr_AverageAnnualReturnYear10 11.85% [23]
Putnam RetirementReady 2055 Fund | Class R6 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 507
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,444
1 Year rr_AverageAnnualReturnYear01 17.55% [24]
5 Years rr_AverageAnnualReturnYear05 12.19% [24]
10 Years rr_AverageAnnualReturnYear10 11.87% [24]
Putnam RetirementReady 2055 Fund | Class Y 2055  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.53%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [17]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.85%) [18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 561
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,557
1 Year rr_AverageAnnualReturnYear01 17.41%
5 Years rr_AverageAnnualReturnYear05 12.06%
10 Years rr_AverageAnnualReturnYear10 11.80%
Putnam RetirementReady 2050 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2050 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 32%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2050 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 (your fund) 2045 2040 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (20.88%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarte
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.93%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.33%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2050 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2050 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [25]
5 Years rr_AverageAnnualReturnYear05 3.57% [25]
10 Years rr_AverageAnnualReturnYear10 2.90% [25]
Putnam RetirementReady 2050 Fund | Class A 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [26]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,202
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,203
Annual Return 2012 rr_AnnualReturn2012 16.06%
Annual Return 2013 rr_AnnualReturn2013 26.18%
Annual Return 2014 rr_AnnualReturn2014 9.09%
Annual Return 2015 rr_AnnualReturn2015 (0.50%)
Annual Return 2016 rr_AnnualReturn2016 6.81%
Annual Return 2017 rr_AnnualReturn2017 19.91%
Annual Return 2018 rr_AnnualReturn2018 (9.61%)
Annual Return 2019 rr_AnnualReturn2019 20.07%
Annual Return 2020 rr_AnnualReturn2020 13.15%
Annual Return 2021 rr_AnnualReturn2021 16.28%
1 Year rr_AverageAnnualReturnYear01 9.59%
5 Years rr_AverageAnnualReturnYear05 10.05%
10 Years rr_AverageAnnualReturnYear10 10.61%
Putnam RetirementReady 2050 Fund | Class A 2050 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 6.31%
5 Years rr_AverageAnnualReturnYear05 7.94%
10 Years rr_AverageAnnualReturnYear10 9.14%
Putnam RetirementReady 2050 Fund | Class A 2050 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 6.82%
5 Years rr_AverageAnnualReturnYear05 7.35%
10 Years rr_AverageAnnualReturnYear10 8.24%
Putnam RetirementReady 2050 Fund | Class B 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [29]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,257
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,338
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,057
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,338
1 Year rr_AverageAnnualReturnYear01 10.36%
5 Years rr_AverageAnnualReturnYear05 10.26%
10 Years rr_AverageAnnualReturnYear10 10.59%
Putnam RetirementReady 2050 Fund | Class C 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [30]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,057
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,338
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,057
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,338
1 Year rr_AverageAnnualReturnYear01 14.37%
5 Years rr_AverageAnnualReturnYear05 10.52%
10 Years rr_AverageAnnualReturnYear10 10.60%
Putnam RetirementReady 2050 Fund | Class R 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 876
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,163
1 Year rr_AverageAnnualReturnYear01 15.77%
5 Years rr_AverageAnnualReturnYear05 11.05%
10 Years rr_AverageAnnualReturnYear10 10.97%
Putnam RetirementReady 2050 Fund | Class R3 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.77%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 745
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,893
1 Year rr_AverageAnnualReturnYear01 16.05% [31]
5 Years rr_AverageAnnualReturnYear05 11.27% [31]
10 Years rr_AverageAnnualReturnYear10 11.19% [31]
Putnam RetirementReady 2050 Fund | Class R4 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.39% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.52%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 611
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,616
1 Year rr_AverageAnnualReturnYear01 16.34% [32]
5 Years rr_AverageAnnualReturnYear05 11.56% [32]
10 Years rr_AverageAnnualReturnYear10 11.47% [32]
Putnam RetirementReady 2050 Fund | Class R5 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,446
1 Year rr_AverageAnnualReturnYear01 16.50% [33]
5 Years rr_AverageAnnualReturnYear05 11.71% [33]
10 Years rr_AverageAnnualReturnYear10 11.58% [33]
Putnam RetirementReady 2050 Fund | Class R6 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 477
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,331
1 Year rr_AverageAnnualReturnYear01 16.61% [34]
5 Years rr_AverageAnnualReturnYear05 11.73% [34]
10 Years rr_AverageAnnualReturnYear10 11.59% [34]
Putnam RetirementReady 2050 Fund | Class Y 2050  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.52%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24% [27]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.61%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.72%) [28]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,446
1 Year rr_AverageAnnualReturnYear01 16.53%
5 Years rr_AverageAnnualReturnYear05 11.63%
10 Years rr_AverageAnnualReturnYear10 11.54%
Putnam RetirementReady 2045 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2045 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 33%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 33.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2045 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 2045 (your fund) 2040 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (19.26%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.12%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2045 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2045 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [35]
5 Years rr_AverageAnnualReturnYear05 3.57% [35]
10 Years rr_AverageAnnualReturnYear10 2.90% [35]
Putnam RetirementReady 2045 Fund | Class A 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [36]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,193
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,171
Annual Return 2012 rr_AnnualReturn2012 15.96%
Annual Return 2013 rr_AnnualReturn2013 25.11%
Annual Return 2014 rr_AnnualReturn2014 8.84%
Annual Return 2015 rr_AnnualReturn2015 (0.51%)
Annual Return 2016 rr_AnnualReturn2016 6.87%
Annual Return 2017 rr_AnnualReturn2017 19.26%
Annual Return 2018 rr_AnnualReturn2018 (9.34%)
Annual Return 2019 rr_AnnualReturn2019 19.21%
Annual Return 2020 rr_AnnualReturn2020 11.85%
Annual Return 2021 rr_AnnualReturn2021 14.64%
1 Year rr_AverageAnnualReturnYear01 8.05%
5 Years rr_AverageAnnualReturnYear05 9.27%
10 Years rr_AverageAnnualReturnYear10 10.09%
Putnam RetirementReady 2045 Fund | Class A 2045 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 4.37%
5 Years rr_AverageAnnualReturnYear05 7.09%
10 Years rr_AverageAnnualReturnYear10 8.59%
Putnam RetirementReady 2045 Fund | Class A 2045 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 6.01%
5 Years rr_AverageAnnualReturnYear05 6.69%
10 Years rr_AverageAnnualReturnYear10 7.78%
Putnam RetirementReady 2045 Fund | Class B 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [39]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,249
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,307
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,049
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,307
1 Year rr_AverageAnnualReturnYear01 8.80%
5 Years rr_AverageAnnualReturnYear05 9.47%
10 Years rr_AverageAnnualReturnYear10 10.07%
Putnam RetirementReady 2045 Fund | Class C 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [40]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,049
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,307
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,049
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,307
1 Year rr_AverageAnnualReturnYear01 12.80%
5 Years rr_AverageAnnualReturnYear05 9.74%
10 Years rr_AverageAnnualReturnYear10 10.08%
Putnam RetirementReady 2045 Fund | Class R 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.98%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 867
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,131
1 Year rr_AverageAnnualReturnYear01 14.19%
5 Years rr_AverageAnnualReturnYear05 10.27%
10 Years rr_AverageAnnualReturnYear10 10.45%
Putnam RetirementReady 2045 Fund | Class R3 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.73%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 736
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,860
1 Year rr_AverageAnnualReturnYear01 14.48% [41]
5 Years rr_AverageAnnualReturnYear05 10.50% [41]
10 Years rr_AverageAnnualReturnYear10 10.67% [41]
Putnam RetirementReady 2045 Fund | Class R4 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.48%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 602
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,582
1 Year rr_AverageAnnualReturnYear01 14.77% [42]
5 Years rr_AverageAnnualReturnYear05 10.78% [42]
10 Years rr_AverageAnnualReturnYear10 10.95% [42]
Putnam RetirementReady 2045 Fund | Class R5 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,411
1 Year rr_AverageAnnualReturnYear01 14.93% [43]
5 Years rr_AverageAnnualReturnYear05 10.93% [43]
10 Years rr_AverageAnnualReturnYear10 11.06% [43]
Putnam RetirementReady 2045 Fund | Class R6 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 467
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,296
1 Year rr_AverageAnnualReturnYear01 15.04% [44]
5 Years rr_AverageAnnualReturnYear05 10.95% [44]
10 Years rr_AverageAnnualReturnYear10 11.08% [44]
Putnam RetirementReady 2045 Fund | Class Y 2045  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22% [37]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.60%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.68%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,411
1 Year rr_AverageAnnualReturnYear01 14.90%
5 Years rr_AverageAnnualReturnYear05 10.86%
10 Years rr_AverageAnnualReturnYear10 11.03%
Putnam RetirementReady 2040 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2040 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 32%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2040 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 2045 2040 (your fund) 2035 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (16.96%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.09%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2040 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2040 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [45]
5 Years rr_AverageAnnualReturnYear05 3.57% [45]
10 Years rr_AverageAnnualReturnYear10 2.90% [45]
Putnam RetirementReady 2040 Fund | Class A 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [46]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.52%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,124
Annual Return 2012 rr_AnnualReturn2012 15.72%
Annual Return 2013 rr_AnnualReturn2013 23.75%
Annual Return 2014 rr_AnnualReturn2014 8.54%
Annual Return 2015 rr_AnnualReturn2015 (0.51%)
Annual Return 2016 rr_AnnualReturn2016 6.73%
Annual Return 2017 rr_AnnualReturn2017 17.95%
Annual Return 2018 rr_AnnualReturn2018 (8.78%)
Annual Return 2019 rr_AnnualReturn2019 17.59%
Annual Return 2020 rr_AnnualReturn2020 9.94%
Annual Return 2021 rr_AnnualReturn2021 12.38%
1 Year rr_AverageAnnualReturnYear01 5.92%
5 Years rr_AverageAnnualReturnYear05 8.06%
10 Years rr_AverageAnnualReturnYear10 9.29%
Putnam RetirementReady 2040 Fund | Class A 2040 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 2.77%
5 Years rr_AverageAnnualReturnYear05 6.16%
10 Years rr_AverageAnnualReturnYear10 7.96%
Putnam RetirementReady 2040 Fund | Class A 2040 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 4.52%
5 Years rr_AverageAnnualReturnYear05 5.79%
10 Years rr_AverageAnnualReturnYear10 7.15%
Putnam RetirementReady 2040 Fund | Class B 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [49]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,259
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,035
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,259
1 Year rr_AverageAnnualReturnYear01 6.58%
5 Years rr_AverageAnnualReturnYear05 8.23%
10 Years rr_AverageAnnualReturnYear10 9.29%
Putnam RetirementReady 2040 Fund | Class C 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [50]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,035
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,259
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,035
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,259
1 Year rr_AverageAnnualReturnYear01 10.55%
5 Years rr_AverageAnnualReturnYear05 8.52%
10 Years rr_AverageAnnualReturnYear10 9.29%
Putnam RetirementReady 2040 Fund | Class R 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.92%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 854
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,082
1 Year rr_AverageAnnualReturnYear01 11.98%
5 Years rr_AverageAnnualReturnYear05 9.04%
10 Years rr_AverageAnnualReturnYear10 9.65%
Putnam RetirementReady 2040 Fund | Class R3 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.67%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 722
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,810
1 Year rr_AverageAnnualReturnYear01 12.25% [51]
5 Years rr_AverageAnnualReturnYear05 9.24% [51]
10 Years rr_AverageAnnualReturnYear10 9.84% [51]
Putnam RetirementReady 2040 Fund | Class R4 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.42%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 588
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,531
1 Year rr_AverageAnnualReturnYear01 12.52% [52]
5 Years rr_AverageAnnualReturnYear05 9.51% [52]
10 Years rr_AverageAnnualReturnYear10 10.11% [52]
Putnam RetirementReady 2040 Fund | Class R5 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 508
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,360
1 Year rr_AverageAnnualReturnYear01 12.68% [53]
5 Years rr_AverageAnnualReturnYear05 9.67% [53]
10 Years rr_AverageAnnualReturnYear10 10.25% [53]
Putnam RetirementReady 2040 Fund | Class R6 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 453
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,244
1 Year rr_AverageAnnualReturnYear01 12.79% [54]
5 Years rr_AverageAnnualReturnYear05 9.70% [54]
10 Years rr_AverageAnnualReturnYear10 10.27% [54]
Putnam RetirementReady 2040 Fund | Class Y 2040  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [47]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.58%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 508
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,360
1 Year rr_AverageAnnualReturnYear01 12.67%
5 Years rr_AverageAnnualReturnYear05 9.62%
10 Years rr_AverageAnnualReturnYear10 10.22%
Putnam RetirementReady 2035 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2035 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 39%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 39.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2035 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 2045 2040 2035 (your fund) 2030 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (14.35%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.57%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2035 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2035 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [55]
5 Years rr_AverageAnnualReturnYear05 3.57% [55]
10 Years rr_AverageAnnualReturnYear10 2.90% [55]
Putnam RetirementReady 2035 Fund | Class A 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [56]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.47%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,169
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,084
Annual Return 2012 rr_AnnualReturn2012 15.08%
Annual Return 2013 rr_AnnualReturn2013 21.16%
Annual Return 2014 rr_AnnualReturn2014 8.07%
Annual Return 2015 rr_AnnualReturn2015 (0.51%)
Annual Return 2016 rr_AnnualReturn2016 6.29%
Annual Return 2017 rr_AnnualReturn2017 15.85%
Annual Return 2018 rr_AnnualReturn2018 (7.80%)
Annual Return 2019 rr_AnnualReturn2019 15.42%
Annual Return 2020 rr_AnnualReturn2020 7.64%
Annual Return 2021 rr_AnnualReturn2021 9.67%
1 Year rr_AverageAnnualReturnYear01 3.37%
5 Years rr_AverageAnnualReturnYear05 6.52%
10 Years rr_AverageAnnualReturnYear10 8.13%
Putnam RetirementReady 2035 Fund | Class A 2035 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 0.04%
5 Years rr_AverageAnnualReturnYear05 4.76%
10 Years rr_AverageAnnualReturnYear10 6.93%
Putnam RetirementReady 2035 Fund | Class A 2035 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 3.07%
5 Years rr_AverageAnnualReturnYear05 4.60%
10 Years rr_AverageAnnualReturnYear10 6.22%
Putnam RetirementReady 2035 Fund | Class B 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [59]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,224
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,219
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,024
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,219
1 Year rr_AverageAnnualReturnYear01 3.97%
5 Years rr_AverageAnnualReturnYear05 6.68%
10 Years rr_AverageAnnualReturnYear10 8.13%
Putnam RetirementReady 2035 Fund | Class C 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [60]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,024
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,219
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,024
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,219
1 Year rr_AverageAnnualReturnYear01 7.90%
5 Years rr_AverageAnnualReturnYear05 6.99%
10 Years rr_AverageAnnualReturnYear10 8.12%
Putnam RetirementReady 2035 Fund | Class R 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.87%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 842
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,041
1 Year rr_AverageAnnualReturnYear01 9.23%
5 Years rr_AverageAnnualReturnYear05 7.48%
10 Years rr_AverageAnnualReturnYear10 8.49%
Putnam RetirementReady 2035 Fund | Class R3 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 710
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,768
1 Year rr_AverageAnnualReturnYear01 9.48% [61]
5 Years rr_AverageAnnualReturnYear05 7.67% [61]
10 Years rr_AverageAnnualReturnYear10 8.65% [61]
Putnam RetirementReady 2035 Fund | Class R4 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 577
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,488
1 Year rr_AverageAnnualReturnYear01 9.77% [62]
5 Years rr_AverageAnnualReturnYear05 7.94% [62]
10 Years rr_AverageAnnualReturnYear10 8.92% [62]
Putnam RetirementReady 2035 Fund | Class R5 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 496
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,316
1 Year rr_AverageAnnualReturnYear01 9.93% [63]
5 Years rr_AverageAnnualReturnYear05 8.11% [63]
10 Years rr_AverageAnnualReturnYear10 9.05% [63]
Putnam RetirementReady 2035 Fund | Class R6 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 442
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,200
1 Year rr_AverageAnnualReturnYear01 10.03% [64]
5 Years rr_AverageAnnualReturnYear05 8.16% [64]
10 Years rr_AverageAnnualReturnYear10 9.10% [64]
Putnam RetirementReady 2035 Fund | Class Y 2035  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [57]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [58]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 496
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,316
1 Year rr_AverageAnnualReturnYear01 9.95%
5 Years rr_AverageAnnualReturnYear05 8.07%
10 Years rr_AverageAnnualReturnYear10 9.05%
Putnam RetirementReady 2030 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2030 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 37%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 37.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2030 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 2045 2040 2035 2030 (your fund) 2025 Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (11.45%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.85%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.05%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2030 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2030 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [65]
5 Years rr_AverageAnnualReturnYear05 3.57% [65]
10 Years rr_AverageAnnualReturnYear10 2.90% [65]
Putnam RetirementReady 2030 Fund | Class A 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [66]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.43%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,161
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,052
Annual Return 2012 rr_AnnualReturn2012 13.79%
Annual Return 2013 rr_AnnualReturn2013 17.87%
Annual Return 2014 rr_AnnualReturn2014 7.66%
Annual Return 2015 rr_AnnualReturn2015 (0.46%)
Annual Return 2016 rr_AnnualReturn2016 5.43%
Annual Return 2017 rr_AnnualReturn2017 13.22%
Annual Return 2018 rr_AnnualReturn2018 (6.50%)
Annual Return 2019 rr_AnnualReturn2019 13.10%
Annual Return 2020 rr_AnnualReturn2020 5.17%
Annual Return 2021 rr_AnnualReturn2021 6.65%
1 Year rr_AverageAnnualReturnYear01 0.52%
5 Years rr_AverageAnnualReturnYear05 4.83%
10 Years rr_AverageAnnualReturnYear10 6.73%
Putnam RetirementReady 2030 Fund | Class A 2030 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (2.23%)
5 Years rr_AverageAnnualReturnYear05 3.31%
10 Years rr_AverageAnnualReturnYear10 5.70%
Putnam RetirementReady 2030 Fund | Class A 2030 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 1.14%
5 Years rr_AverageAnnualReturnYear05 3.33%
10 Years rr_AverageAnnualReturnYear10 5.10%
Putnam RetirementReady 2030 Fund | Class B 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [69]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,215
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,187
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,015
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,187
1 Year rr_AverageAnnualReturnYear01 0.96%
5 Years rr_AverageAnnualReturnYear05 4.95%
10 Years rr_AverageAnnualReturnYear10 6.72%
Putnam RetirementReady 2030 Fund | Class C 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [70]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,015
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,187
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,015
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,187
1 Year rr_AverageAnnualReturnYear01 4.87%
5 Years rr_AverageAnnualReturnYear05 5.29%
10 Years rr_AverageAnnualReturnYear10 6.73%
Putnam RetirementReady 2030 Fund | Class R 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.83%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 833
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,009
1 Year rr_AverageAnnualReturnYear01 6.25%
5 Years rr_AverageAnnualReturnYear05 5.79%
10 Years rr_AverageAnnualReturnYear10 7.08%
Putnam RetirementReady 2030 Fund | Class R3 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 701
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,735
1 Year rr_AverageAnnualReturnYear01 6.48% [71]
5 Years rr_AverageAnnualReturnYear05 5.94% [71]
10 Years rr_AverageAnnualReturnYear10 7.22% [71]
Putnam RetirementReady 2030 Fund | Class R4 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 568
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,454
1 Year rr_AverageAnnualReturnYear01 6.75% [72]
5 Years rr_AverageAnnualReturnYear05 6.21% [72]
10 Years rr_AverageAnnualReturnYear10 7.49% [72]
Putnam RetirementReady 2030 Fund | Class R5 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 487
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,281
1 Year rr_AverageAnnualReturnYear01 6.91% [73]
5 Years rr_AverageAnnualReturnYear05 6.36% [73]
10 Years rr_AverageAnnualReturnYear10 7.61% [73]
Putnam RetirementReady 2030 Fund | Class R6 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 432
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,165
1 Year rr_AverageAnnualReturnYear01 7.01% [74]
5 Years rr_AverageAnnualReturnYear05 6.43% [74]
10 Years rr_AverageAnnualReturnYear10 7.68% [74]
Putnam RetirementReady 2030 Fund | Class Y 2030  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.48%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18% [67]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.52%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [68]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 487
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,281
1 Year rr_AverageAnnualReturnYear01 6.89%
5 Years rr_AverageAnnualReturnYear05 6.34%
10 Years rr_AverageAnnualReturnYear10 7.63%
Putnam RetirementReady 2025 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady 2025 Fund seeks capital appreciation and current income consistent with a decreasing emphasis on capital appreciation and an increasing emphasis on current income as it approaches its target date.

Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 57%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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 Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund’s asset allocation strategy may be attractive to investors who plan to retire or otherwise intend to begin making periodic withdrawals of their investments in or about 2025 (the target date). The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The fund’s target allocations among asset classes and underlying funds will increasingly emphasize capital preservation and income over time and will change gradually based on the number of remaining years until the fund’s target date, as shown in the predetermined “glide path” in the chart under “What are the funds’ and each underlying fund’s main investment strategies and related risks?” Putnam Investment Management, LLC (Putnam Management) adjusts these allocations at the end of each calendar quarter based on the glide path.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022 and its projected approximate allocations to those asset classes and underlying funds as of September 30, 2023. By comparing the percentage allocations of your fund in the table, you can see how its allocations are expected to change during the one-year period beginning on September 30, 2022. The table also shows the approximate allocations of other Putnam RetirementReady® Funds, which are designed for investors with different target retirement dates. Over a five-year period, each fund’s allocations will gradually change to resemble the allocations of the fund with the next earliest target date. The table illustrates how a fund’s allocations are expected to change over time to increasingly emphasize capital preservation and income.



 



Underlying Fund* Year 2065 2060 2055 2050 2045 2040 2035 2030 2025 (your fund) Maturity Fund
Putnam Dynamic Asset Allocation Equity Fund 2022 73.2% 68.5% 52.3% 33.2% 10.5% 0.0% 0.0% 0.0% 0.0% 0.0%
2023 73.2% 65.6% 48.8% 28.2% 7.1% 0.0% 0.0% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Growth Fund 2022 16.0% 20.5% 36.0% 53.9% 68.0% 52.9% 17.5% 0.0% 0.0% 0.0%
2023 16.0% 23.3% 39.4% 58.3% 68.0% 45.1% 11.6% 0.0% 0.0% 0.0%
Putnam Dynamic Asset Allocation Balanced Fund 2022 0.0% 0.0% 0.0% 0.0% 3.8% 21.7% 46.9% 41.8% 14.3% 0.0%
2023 0.0% 0.0% 0.0% 0.0% 5.8% 27.8% 49.5% 36.1% 9.3% 0.0%
Putnam Dynamic Asset Allocation Conservative Fund 2022 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.0% 12.1% 27.4% 34.0%
2023 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.0% 15.4% 29.8% 34.0%
Putnam Government Money Market Fund 2022 0.5% 0.5% 0.5% 0.5% 1.8% 3.0% 4.0% 5.2% 6.0% 6.0%
2023 0.5% 0.5% 0.5% 0.7% 2.1% 3.2% 4.3% 5.5% 6.0% 6.0%
Putnam Fixed Income Absolute Return Fund 2022 0.6% 0.8% 1.5% 2.5% 2.9% 5.3% 9.7% 15.1% 22.8% 30.0%
2023 0.6% 0.9% 1.6% 2.5% 3.2% 6.1% 10.8% 16.2% 25.1% 30.0%
Putnam Multi-Asset Absolute Return Fund 2022 9.7% 9.7% 9.7% 9.9% 13.0% 17.1% 20.9% 25.8% 29.5% 30.0%
2023 9.7% 9.7% 9.7% 10.3% 13.8% 17.8% 21.8% 26.8% 29.8% 30.0%
Equity** 2022 86.0% 84.9% 81.1% 76.3% 67.2% 55.3% 42.4% 28.7% 16.8% 10.2%
2023 86.0% 84.2% 80.3% 74.8% 65.0% 52.8% 39.6% 26.3% 14.5% 10.2%
Fixed Income** 2022 3.7% 4.6% 7.7% 11.3% 16.9% 22.3% 27.0% 30.4% 30.9% 29.8%
2023 3.7% 5.2% 8.4% 12.4% 18.0% 23.3% 27.8% 30.7% 30.6% 29.8%
Absolute Return** 2022 10.3% 10.5% 11.2% 12.4% 15.9% 22.4% 30.6% 40.9% 52.3% 60.0%
2023 10.3% 10.6% 11.3% 12.8% 17.0% 23.9% 32.6% 43.0% 54.9% 60.0%
* Due to rounding, allocations shown in the table above may not total 100%. In addition, because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on each Putnam Dynamic Asset Allocation Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.



 



The fund’s target allocations may differ from the allocations shown in the table. We may change the glide path, the fund’s target allocations, and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. We assume investors will begin gradual withdrawals from the fund at around the target date. Near the end of the target date year, the fund’s target allocations will correspond to those of Putnam RetirementReady Maturity Fund (Maturity Fund), a fund that seeks as high a rate of current income as Putnam Management believes is consistent with preservation of capital, and the fund will be merged into Maturity Fund. More information about Maturity Fund is available in the prospectus beginning on page 81 and more information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. Losses may occur near, at or after the target date. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative



 



models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.



 



Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (8.81%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.25%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.74%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady 2025 Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady 2025 Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [75]
5 Years rr_AverageAnnualReturnYear05 3.57% [75]
10 Years rr_AverageAnnualReturnYear10 2.90% [75]
Putnam RetirementReady 2025 Fund | Class A 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [76]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.42%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 662
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 845
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,158
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,044
Annual Return 2012 rr_AnnualReturn2012 12.00%
Annual Return 2013 rr_AnnualReturn2013 14.28%
Annual Return 2014 rr_AnnualReturn2014 7.04%
Annual Return 2015 rr_AnnualReturn2015 (0.49%)
Annual Return 2016 rr_AnnualReturn2016 4.41%
Annual Return 2017 rr_AnnualReturn2017 10.56%
Annual Return 2018 rr_AnnualReturn2018 (5.45%)
Annual Return 2019 rr_AnnualReturn2019 10.85%
Annual Return 2020 rr_AnnualReturn2020 2.96%
Annual Return 2021 rr_AnnualReturn2021 3.60%
1 Year rr_AverageAnnualReturnYear01 (2.36%)
5 Years rr_AverageAnnualReturnYear05 3.10%
10 Years rr_AverageAnnualReturnYear10 5.19%
Putnam RetirementReady 2025 Fund | Class A 2025 | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (4.24%)
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 4.30%
Putnam RetirementReady 2025 Fund | Class A 2025 | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (0.74%)
5 Years rr_AverageAnnualReturnYear05 2.06%
10 Years rr_AverageAnnualReturnYear10 3.87%
Putnam RetirementReady 2025 Fund | Class B 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [79]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 668
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 820
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,179
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,013
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,179
1 Year rr_AverageAnnualReturnYear01 (1.99%)
5 Years rr_AverageAnnualReturnYear05 3.21%
10 Years rr_AverageAnnualReturnYear10 5.18%
Putnam RetirementReady 2025 Fund | Class C 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [80]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,013
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,179
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,013
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,179
1 Year rr_AverageAnnualReturnYear01 1.88%
5 Years rr_AverageAnnualReturnYear05 3.55%
10 Years rr_AverageAnnualReturnYear10 5.17%
Putnam RetirementReady 2025 Fund | Class R 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.82%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 831
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,001
1 Year rr_AverageAnnualReturnYear01 3.18%
5 Years rr_AverageAnnualReturnYear05 4.03%
10 Years rr_AverageAnnualReturnYear10 5.53%
Putnam RetirementReady 2025 Fund | Class R3 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.57%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 699
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,727
1 Year rr_AverageAnnualReturnYear01 3.45% [81]
5 Years rr_AverageAnnualReturnYear05 4.18% [81]
10 Years rr_AverageAnnualReturnYear10 5.66% [81]
Putnam RetirementReady 2025 Fund | Class R4 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.32%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 565
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,445
1 Year rr_AverageAnnualReturnYear01 3.73% [82]
5 Years rr_AverageAnnualReturnYear05 4.44% [82]
10 Years rr_AverageAnnualReturnYear10 5.92% [82]
Putnam RetirementReady 2025 Fund | Class R5 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 484
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,273
1 Year rr_AverageAnnualReturnYear01 3.85% [83]
5 Years rr_AverageAnnualReturnYear05 4.61% [83]
10 Years rr_AverageAnnualReturnYear10 6.05% [83]
Putnam RetirementReady 2025 Fund | Class R6 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 430
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,156
1 Year rr_AverageAnnualReturnYear01 4.00% [84]
5 Years rr_AverageAnnualReturnYear05 4.70% [84]
10 Years rr_AverageAnnualReturnYear10 6.13% [84]
Putnam RetirementReady 2025 Fund | Class Y 2025  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.47%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [77]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.52%) [78]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 484
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,273
1 Year rr_AverageAnnualReturnYear01 3.86%
5 Years rr_AverageAnnualReturnYear05 4.59%
10 Years rr_AverageAnnualReturnYear10 6.07%
Putnam RetirementReady Maturity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Objective [Heading] rr_ObjectiveHeading Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Putnam RetirementReady Maturity Fund seeks as high a rate of current income as Putnam Investment Management, LLC (Putnam Management) believes is consistent with preservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following tables describe the fees and expenses you may pay if 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 $100,000 in class A shares of Putnam funds. More information about these and other discounts is available from your financial professional and in How do I buy fund shares? beginning on page 117 of the fund’s prospectus, in the Appendix to the fund’s prospectus, and in How to buy shares beginning on page II-1 of the fund’s statement of additional information (SAI).

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2025.
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction-related costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher turnover rate may indicate higher transaction costs and may result in higher taxes when the fund’s shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or the above example, affect fund performance. The fund’s turnover rate in the most recent fiscal year was 24%.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in class A shares of Putnam funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following hypothetical example is intended to help you compare the cost of investing in the fund with the cost of investing in other funds. It assumes that you invest $10,000 in the fund for the time periods indicated and then, except as indicated, redeem all your shares at the end of those periods. It assumes a 5% return on your investment each year and that the fund’s operating expenses remain the same. Only the first three years of each period in the example takes into account the expense reimbursement described above. Your actual costs may be higher or lower.

Strategy [Heading] rr_StrategyHeading Investments, risks, and performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Investments

The fund employs an asset allocation strategy designed for investors who are already in retirement or who plan to retire (or otherwise begin withdrawing the invested funds) in the near future. The fund is designed to provide diversification among different asset classes by investing its assets in other Putnam mutual funds, referred to as underlying funds.

The following table presents your fund’s approximate allocations to each asset class and underlying fund as of September 30, 2022, which are not expected to change over time.

Underlying funds*  
Putnam Dynamic Asset Allocation Conservative Fund 34.0%
Putnam Government Money Market Fund 6.0%
Putnam Fixed Income Absolute Return Fund 30.0%
Putnam Multi-Asset Absolute Return Fund 30.0%
Equity** 10.2%
Fixed Income** 29.8%
Absolute Return** 60.0%
* Because of rounding in the calculation of allocations among underlying funds and market fluctuations, actual allocations might be more or less than these percentages.
** Equity, fixed income and absolute return allocations are hypothetical estimates based on Putnam Dynamic Asset Allocation Conservative Fund’s current strategic allocation to equity and fixed income investments; an assumption that Putnam Government Money Market Fund is equivalent to a fixed income investment; and assumptions that Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund are equivalent to an absolute return investment. Putnam Multi-Asset Absolute Return Fund and Putnam Fixed Income Absolute Return Fund follow an “absolute return” strategy that seeks to earn a positive total return over a reasonable period of time, regardless of market conditions or general market direction. The managers of the underlying funds may adjust those funds’ allocations among asset classes from time to time consistent with their investment goals, and, consequently, actual allocations will vary.

The fund’s target allocations may differ from the allocations shown in the table. We may change the fund’s target allocations and the underlying funds in which it invests at any time, although we expect these changes to be infrequent and generally in response to longer-term structural changes (i.e., in the average retirement age or life expectancy) that lead the fund’s portfolio managers to determine that a change is advisable. Putnam Management rebalances the fund’s investments towards its target



 



allocations on a quarterly basis. We assume investors will make gradual withdrawals from the fund. More information about the underlying funds (which are not offered by this prospectus) is included under “What are the funds’ and each underlying fund’s main investment strategies and related risks?”.
Risk [Heading] rr_RiskHeading Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

It is important to understand that you can lose money by investing in the fund. There is no guarantee that the fund will provide adequate income at and through an investor’s retirement.

The fund’s allocation of assets among asset classes and the underlying funds may hurt performance.

The fund invests in underlying funds and indirectly bears expenses related to the underlying funds. However, Putnam Management has contractually agreed to waive fees, reimburse expenses of, or reimburse the fund through at least November 30, 2025 in an amount equal to the fund’s acquired fund fees and expenses (i.e., the fees and expenses incurred by the fund as a result of its investments in the underlying funds). Putnam Management also has contractually agreed to waive fees and/or reimburse expenses of each class of shares of the fund through at least November 30, 2025 in an amount sufficient to result in total annual fund operating expenses for class A, B, C, R, R3, R4, R5, R6 and Y shares of the fund (exclusive of certain fees and expenses, including distribution fees (12b-1 fees)) that equal 0.65%, 0.65%, 0.65%, 0.80%, 0.80%, 0.80%, 0.65%, 0.55%, and 0.65%, respectively, of the fund’s average net assets. Although Putnam Management serves as the investment adviser of the underlying funds, an underlying fund may change its investment program or policies without the fund’s approval, which could require the fund to reduce or eliminate its allocation to the underlying fund at an unfavorable time.

The fund also bears the following risks associated with the underlying funds:

There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the underlying funds will produce the intended outcome or that the investments we select for the underlying funds will perform as well as other securities that were not selected for the underlying funds. We, or the underlying funds’ other service providers, may experience disruptions or operating errors that could negatively impact the underlying funds. If the quantitative models or data that are used in managing an underlying fund prove to be incorrect or incomplete, investment decisions made in reliance on the models or data may not produce the desired results and the fund may realize losses.

An underlying fund’s allocation of assets among asset classes may hurt performance. The value of investments in the underlying funds’ portfolios may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, and factors related to a specific issuer, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the underlying funds’ portfolio holdings. The



 



novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the fund invests and exacerbate other risks that apply to the fund. These effects could negatively impact the fund’s performance and lead to losses on your investment in the fund. Growth stocks may be more susceptible to earnings disappointments, and value stocks may fail to rebound. These risks are generally greater for small and midsize companies.

Bond investments are subject to interest rate risk, which is the risk that the value of the underlying funds’ bond investments is likely to fall if interest rates rise. Bond investments also are subject to credit risk, which is the risk that the issuers of the underlying funds’ bond investments may default on payment of interest or principal. Bond investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term bonds, and credit risk is generally greater for below-investment-grade bonds (sometimes referred to as “junk bonds”), which can be more sensitive to changes in markets, credit conditions, and interest rates and may be considered speculative. Default risk is generally higher for non-qualified mortgages. Mortgage-backed investments, unlike traditional debt investments, are also subject to prepayment risk, which means that they may increase in value less than other bonds when interest rates decline and decline in value more than other bonds when interest rates rise. The underlying funds may have to invest the proceeds from prepaid investments, including mortgage- and asset-backed investments, in other investments with less attractive terms and yields.

The value of international investments traded in foreign currencies may be adversely impacted by fluctuations in exchange rates. International investments, particularly investments in emerging markets, may carry risks associated with potentially less stable economies or governments (such as the risk of seizure by a foreign government, the imposition of currency or other restrictions, or high levels of inflation), and may be or become illiquid.

An underlying fund’s non-directional strategies may lose money or not earn a return sufficient to cover trading and other costs and an underlying fund’s allocation of assets among permitted asset categories may hurt performance.

Real estate investment trusts (REITs), which pool investors’ funds for investment primarily in income-producing real estate properties or real estate-related loans (such as mortgages), are subject to the risks associated with owning, operating, and financing real estate, including economic downturns that have an adverse impact on real estate markets. Commodity-linked notes are subject to the same risks as commodities, such as weather, disease, political, tax and other regulatory developments and other factors affecting the value of commodities.

Each underlying fund, except Putnam Government Money Market Fund, may use derivatives, such as futures, options, certain foreign currency transactions, warrants and swap contracts, for both hedging and investment purposes. Putnam Fixed



 



Income Absolute Return Fund and Putnam Multi-Asset Absolute Return Fund intend to use derivatives to increase investment exposure, which is an important component of the funds’ investment strategies. Underlying funds that use derivatives to increase investment exposure are riskier than underlying funds that do not employ investment leverage. The value of derivatives may move in unexpected ways due to unanticipated market movements, the use of leverage, imperfect correlation between the derivative instrument and the reference asset, or other factors, especially in unusual market conditions, and volatility in the value of derivatives could adversely impact the underlying fund’s returns, obligations and exposures. Derivatives are also subject to other risks, including liquidity risk (e.g., liquidity demands arising from the requirement to make payments to a derivative counterparty), operational risk (e.g., settlement issues or system failures), and legal risk (e.g., insufficient legal documentation or contract enforceability issues). Derivatives also involve the risk that an underlying fund may be unable to terminate or sell derivatives positions when it wants to and that the other party to the instrument may fail to meet its obligations. The risk of a party failing to meet its obligations may increase if the underlying fund has significant investment exposure to that counterparty.

The efforts of some underlying funds to produce lower volatility returns may not be successful. In addition, under certain market conditions, these funds may accept greater volatility than would typically be the case.

The fund may not achieve its goal, and it is not intended to be a complete investment program. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Investor profile

The fund is designed for investors in or near retirement or otherwise seeking an investment for use with a periodic withdrawal program. Investors are encouraged to seek the assistance of a financial advisor in developing a periodic withdrawal program that is appropriate to their personal investment goals and financial circumstances. The fund also serves as the fund into which each of the Putnam RetirementReady Funds will be merged near the end of the target date year of the Putnam RetirementReady Fund. The fund makes no representations regarding its suitability for any particular investor or periodic withdrawal program. Investors should understand that pursuing higher returns may involve higher volatility and that a fund’s performance results may not be sustainable.

Risk Lose Money [Text] rr_RiskLoseMoney It is important to understand that you can lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time. The bar chart does not reflect the impact of sales charges. If it did, performance would be lower. Please remember that past performance is not necessarily an indication of future results. Monthly performance figures for the fund are available at putnam.com.



 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information below gives some indication of the risks associated with an investment in the fund by showing the fund’s performance year to year and over time.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress putnam.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please remember that past performance is not necessarily an indication of future results.
Bar Chart [Heading] rr_BarChartHeading Annual total returns for class A shares before sales charges
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the impact of sales charges.
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date performance through
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (6.98%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best calendar quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.52%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst calendar quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.69%)
Performance Table Heading rr_PerformanceTableHeading Average annual total returns after sales charges (for periods ended 12/31/21)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for class A shares only and will vary for other classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
BLOOMBERG® is a trademark and service mark of Bloomberg Finance L.P. and its affiliates (collectively “Bloomberg”). Bloomberg or Bloomberg’s licensors own all proprietary rights in the Bloomberg Indices. Neither Bloomberg nor Bloomberg’s licensors approve or endorse this material, or guarantees the accuracy or completeness of any information herein, or makes any warranty, express or implied, as to the results to be obtained therefrom, and to the maximum extent allowed by law, neither shall have any liability or responsibility for injury or damages arising in connection therewith.



 



After-tax returns reflect the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns are shown for class A shares only and will vary for other classes. These after-tax returns do not apply if you hold your fund shares through a 401(k) plan, an IRA, or another tax-advantaged arrangement.
Class B and C share performance reflects conversion to class A shares after eight years.
The Bloomberg U.S. Aggregate Bond Index and the S&P 500 Index are broad measures of market performance. Securities in the fund do not match those in the indexes and the performance of the fund will differ.
Putnam RetirementReady Maturity Fund | S&P 500 Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Putnam RetirementReady Maturity Fund | Bloomberg U.S. Aggregate Bond Index (no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.54%) [85]
5 Years rr_AverageAnnualReturnYear05 3.57% [85]
10 Years rr_AverageAnnualReturnYear10 2.90% [85]
Putnam RetirementReady Maturity Fund | Class A Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.00%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [86]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 486
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 669
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 979
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,858
Annual Return 2012 rr_AnnualReturn2012 7.08%
Annual Return 2013 rr_AnnualReturn2013 5.52%
Annual Return 2014 rr_AnnualReturn2014 4.42%
Annual Return 2015 rr_AnnualReturn2015 (0.58%)
Annual Return 2016 rr_AnnualReturn2016 2.52%
Annual Return 2017 rr_AnnualReturn2017 6.80%
Annual Return 2018 rr_AnnualReturn2018 (4.13%)
Annual Return 2019 rr_AnnualReturn2019 8.46%
Annual Return 2020 rr_AnnualReturn2020 1.01%
Annual Return 2021 rr_AnnualReturn2021 1.00%
1 Year rr_AverageAnnualReturnYear01 (3.04%)
5 Years rr_AverageAnnualReturnYear05 1.70%
10 Years rr_AverageAnnualReturnYear10 2.72%
Putnam RetirementReady Maturity Fund | Class A Maturity | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (4.16%)
5 Years rr_AverageAnnualReturnYear05 0.75%
10 Years rr_AverageAnnualReturnYear10 1.85%
Putnam RetirementReady Maturity Fund | Class A Maturity | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (1.57%)
5 Years rr_AverageAnnualReturnYear05 0.97%
10 Years rr_AverageAnnualReturnYear10 1.78%
Putnam RetirementReady Maturity Fund | Class B Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 5.00% [89]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 666
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 814
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,198
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,142
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 166
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 514
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 998
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,142
1 Year rr_AverageAnnualReturnYear01 (4.62%)
5 Years rr_AverageAnnualReturnYear05 1.40%
10 Years rr_AverageAnnualReturnYear10 2.52%
Putnam RetirementReady Maturity Fund | Class C Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00% [90]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 266
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 514
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 998
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,142
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 166
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 514
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 998
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,142
1 Year rr_AverageAnnualReturnYear01 (0.72%)
5 Years rr_AverageAnnualReturnYear05 1.76%
10 Years rr_AverageAnnualReturnYear10 2.52%
Putnam RetirementReady Maturity Fund | Class R Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.78%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.28%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 130
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 406
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 816
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,963
1 Year rr_AverageAnnualReturnYear01 0.61%
5 Years rr_AverageAnnualReturnYear05 2.24%
10 Years rr_AverageAnnualReturnYear10 2.87%
Putnam RetirementReady Maturity Fund | Class R3 Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.53%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.03%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 684
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,687
1 Year rr_AverageAnnualReturnYear01 0.84% [91]
5 Years rr_AverageAnnualReturnYear05 2.37% [91]
10 Years rr_AverageAnnualReturnYear10 2.98% [91]
Putnam RetirementReady Maturity Fund | Class R4 Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.28%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.78%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 249
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 550
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,405
1 Year rr_AverageAnnualReturnYear01 1.15% [92]
5 Years rr_AverageAnnualReturnYear05 2.63% [92]
10 Years rr_AverageAnnualReturnYear10 3.25% [92]
Putnam RetirementReady Maturity Fund | Class R5 Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 469
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,232
1 Year rr_AverageAnnualReturnYear01 1.24% [93]
5 Years rr_AverageAnnualReturnYear05 2.79% [93]
10 Years rr_AverageAnnualReturnYear10 3.37% [93]
Putnam RetirementReady Maturity Fund | Class R6 Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.07% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.03%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 170
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 414
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,115
1 Year rr_AverageAnnualReturnYear01 1.35% [94]
5 Years rr_AverageAnnualReturnYear05 2.87% [94]
10 Years rr_AverageAnnualReturnYear10 3.45% [94]
Putnam RetirementReady Maturity Fund | Class Y Maturity  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.46%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17% [87]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.50%) [88]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 469
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,232
1 Year rr_AverageAnnualReturnYear01 1.32%
5 Years rr_AverageAnnualReturnYear05 2.79%
10 Years rr_AverageAnnualReturnYear10 3.40%
[1] Applies only to certain redemptions of shares bought with no initial sales charge.
[2] Restated to reflect current fees.
[3] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[4] This charge is eliminated after one year.
[5] Source: Bloomberg Index Services Limited
[6] Applies only to certain redemptions of shares bought with no initial sales charge.
[7] Restated to reflect current fees.
[8] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2032. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[9] This charge is phased out over six years.
[10] This charge is eliminated after one year.
[11] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to class Y shares prior to the inception of class R3 shares)
[12] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[13] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares and has not been adjusted for the lower fund expenses applicable to class R5 shares (relative to the comparable expenses applicable to R6 shares prior to the inception of class R5 shares); had it, returns would have been higher.
[14] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[15] Source: Bloomberg Index Services Limited
[16] Applies only to certain redemptions of shares bought with no initial sales charge.
[17] Restated to reflect current fees.
[18] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[19] This charge is phased out over six years.
[20] This charge is eliminated after one year.
[21] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[22] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[23] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares and has not been adjusted for the lower fund expenses applicable to class R5 shares (relative to the comparable expenses applicable to R6 shares prior to the inception of class R5 shares); had it, returns would have been higher.
[24] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[25] Source: Bloomberg Index Services Limited
[26] Applies only to certain redemptions of shares bought with no initial sales charge.
[27] Restated to reflect current fees.
[28] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[29] This charge is phased out over six years.
[30] This charge is eliminated after one year.
[31] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[32] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[33] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares and has not been adjusted for the lower fund expenses applicable to class R5 shares (relative to the comparable expenses applicable to R6 shares prior to the inception of class R5 shares); had it, returns would have been higher.
[34] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[35] Source: Bloomberg Index Services Limited
[36] Applies only to certain redemptions of shares bought with no initial sales charge.
[37] Restated to reflect current fees.
[38] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[39] This charge is phased out over six years.
[40] This charge is eliminated after one year.
[41] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[42] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[43] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares and has not been adjusted for the lower fund expenses applicable to class R5 shares (relative to the comparable expenses applicable to R6 shares prior to the inception of class R5 shares); had it, returns would have been higher.
[44] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[45] Source: Bloomberg Index Services Limited
[46] Applies only to certain redemptions of shares bought with no initial sales charge.
[47] Restated to reflect current fees
[48] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[49] This charge is phased out over six years.
[50] This charge is eliminated after one year.
[51] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[52] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[53] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares, adjusted for the higher investor servicing fees applicable to class R5 shares (relative to the comparable fees applicable to R6 shares prior to the inception of class R5 shares).
[54] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[55] Source: Bloomberg Index Services Limited
[56] Applies only to certain redemptions of shares bought with no initial sales charge.
[57] Restated to reflect current fees.
[58] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[59] This charge is phased out over six years.
[60] This charge is eliminated after one year.
[61] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[62] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[63] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares, adjusted for the higher investor servicing fees applicable to class R5 shares (relative to the comparable fees applicable to R6 shares prior to the inception of class R5 shares).
[64] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[65] Source: Bloomberg Index Services Limited
[66] Applies only to certain redemptions of shares bought with no initial sales charge.
[67] Restated to reflect current fees.
[68] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[69] This charge is phased out over six years.
[70] This charge is eliminated after one year.
[71] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[72] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[73] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares, adjusted for the higher investor servicing fees applicable to class R5 shares (relative to the comparable fees applicable to R6 shares prior to the inception of class R5 shares).
[74] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[75] Source: Bloomberg Index Services Limited
[76] Applies only to certain redemptions of shares bought with no initial sales charge.
[77] Restated to reflect current fees.
[78] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[79] This charge is phased out over six years.
[80] This charge is eliminated after one year.
[81] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[82] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[83] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares, adjusted for the higher investor servicing fees applicable to class R5 shares (relative to the comparable fees applicable to R6 shares prior to the inception of class R5 shares).
[84] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.
[85] Source: Bloomberg Index Services Limited
[86] Applies only to certain redemptions of shares bought with no initial sales charge.
[87] Restated to reflect current fees.
[88] Reflects Putnam Investment Management, LLC’s contractual obligation to limit certain fund expenses through November 30, 2025. This obligation may be modified or discontinued only with approval of the Board of Trustees.
[89] This charge is phased out over six years.
[90] This charge is eliminated after one year.
[91] Performance for class R3 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher 12b-1 fees and investor servicing fees applicable to class R3 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R3 shares).
[92] Performance for class R4 shares prior to their inception (1/4/21) is derived from the historical performance of class Y shares, adjusted for the higher investor servicing fees applicable to class R4 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R4 shares).
[93] Performance for class R5 shares prior to their inception (1/4/21) is derived from the historical performance of class R6 shares, adjusted for the higher investor servicing fees applicable to class R5 shares (relative to the comparable fees applicable to R6 shares prior to the inception of class R5 shares).
[94] Performance for class R6 shares prior to their inception (9/1/16) is derived from the historical performance of class Y shares and has not been adjusted for the lower investor servicing fees applicable to class R6 shares (relative to the comparable fees applicable to Y shares prior to the inception of class R6 shares); had it, returns would have been higher.