| Label | Element | Value | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| Document Type | dei_DocumentType | 485BPOS | ||||||||||||
| Document Period End Date | dei_DocumentPeriodEndDate | Dec. 31, 2023 | ||||||||||||
| Entity Registrant Name | dei_EntityRegistrantName | Putnam Investment Funds | ||||||||||||
| Entity Central Index Key | dei_EntityCentralIndexKey | 0000932101 | ||||||||||||
| Entity Inv Company Type | dei_EntityInvCompanyType | N-1A | ||||||||||||
| Amendment Flag | dei_AmendmentFlag | false | ||||||||||||
| Putnam Sustainable Future Fund | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| Risk/Return [Heading] | rr_RiskReturnHeading | Fund summary | ||||||||||||
| Objective [Heading] | rr_ObjectiveHeading | Goal | ||||||||||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | Putnam Sustainable Future Fund seeks long-term capital appreciation. |
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| 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 16 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). |
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| 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) | ||||||||||||
| 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 43%. |
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| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 43.00% | ||||||||||||
| 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. Your actual costs may be higher or lower. |
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| Strategy [Heading] | rr_StrategyHeading | Investments, risks, and performance | ||||||||||||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | Investments We invest mainly in common stocks of U.S. companies of any size, with a focus on companies whose products and services we believe provide solutions that directly contribute to sustainable social, environmental and economic development (Solutions Companies). Stocks of this type of company are typically, but not always, considered to be growth stocks. Growth stocks are stocks of companies whose revenues, earnings, or cash flows are expected to grow faster than those of similar firms, and whose business growth and other characteristics may lead to an increase in stock price. We may consider, among other factors, a company’s impact on sustainable environmental, social and economic development (as described below), valuation, financial strength, growth potential, competitive position in its industry, projected future earnings, cash flows and dividends when deciding whether to buy or sell investments. We may also invest in non-U.S. companies. Our approach to sustainable investing incorporates fundamental research together with consideration of sustainable environmental, social and economic development impact. We believe that companies whose products and services produce positive environmental, social and economic development impact also often demonstrate
potential for strong financial growth. Under normal circumstances, the fund invests at least 80% of the value of its net assets in securities that meet our sustainability criteria. These criteria are based on a proprietary sustainability solutions map that links to the United Nations Sustainable Development Goals (SDGs). In applying these criteria, we will assign each company a proprietary environmental, social and/or corporate governance (ESG) rating ranging from 1 to 4 (1 indicating the highest (best) ESG rating and 4 indicating the lowest (worst) ESG rating). In order to meet our sustainability criteria for purposes of this investment policy, a company must be rated 2 or 1 by us. This policy is non-fundamental and may be changed only after 60 days’ notice to shareholders. In selecting each investment, we consider the extent to which a company’s products or services may provide solutions to forward-looking sustainability needs, creating positive impact in environmental, social and economic development areas. Environmental impacts may include, for example, reduction of carbon emissions and improved water quality. Social impacts may include, for example, improvements in employee well-being, supplier standards, or access to products, information, or security. Economic development impacts may include, for example, stakeholder analysis and shared value approaches to business practices, access to economic opportunity, or improvements in operational effectiveness or efficiency. |
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| Risk [Heading] | rr_RiskHeading | Risks | ||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | It is important to understand that you can lose money by investing in the fund. The value of investments in the fund’s portfolio 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, outbreaks of infectious illnesses or other widespread public health issues, 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 fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject. The value of a company’s stock may fall or fail to rise as a result of factors directly relating to that company, such as decisions made by its management or lower demand for the company’s products or services. A stock’s value may also fall because of factors affecting not just the company, but also other companies in the same industry or in a number of different industries, such as increases in production costs. Growth stocks may be more susceptible to earnings disappointments and the market may not favor growth-style investing. These risks are generally greater for small and midsized companies. From time to time, the fund may invest a significant portion of its assets in companies in one or more related industries or sectors, which would make the fund more vulnerable to adverse developments affecting those industries or sectors.
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. Investing with a focus on Solutions Companies, whose products and services may provide solutions that directly impact sustainable environmental, social and economic development, may result in the fund investing in certain types of companies, industries or sectors that the market may not favor. In evaluating an investment opportunity, we may make investment decisions based on information and data that is incomplete or inaccurate. Sustainability and ESG factors are not uniformly defined and applying such factors involves subjective assessments. Sustainability and ESG scorings and assessments of issuers can vary across third-party data providers and may change over time. In addition, a company’s business practices, products or services may change over time. As a result of these possibilities, among others, the fund may temporarily hold securities that are inconsistent with the fund’s sustainable investment criteria. Regulatory changes or interpretations regarding the definitions and/or use of ESG or other sustainability criteria could have a material adverse effect on the fund’s ability to invest in accordance with its investment policies and/or achieve its investment objective, as well as the ability of certain classes of investors to invest in funds, such as the fund, whose strategies include ESG or other sustainability criteria. There is no guarantee that the investment techniques, analyses, or judgments that we apply in making investment decisions for the fund will produce the intended outcome or that the investments we select for the fund will perform as well as other securities that were not selected for the fund. We, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund. The fund may be an investment option for mutual funds that are managed by Franklin Resources, Inc. (Franklin Templeton) and its affiliates as “funds of funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. Dispositions of a large number of shares by these shareholders may adversely affect the fund’s liquidity and net assets. These redemptions may also force the fund to sell securities, which may increase the fund’s brokerage costs. 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. |
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| 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. Before March 21, 2018, the fund was managed with a materially different
investment strategy and may have achieved materially different performance results under its current investment strategy from that shown for periods before this date. 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 franklintempleton.com |
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| 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 | franklintempleton.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 | Jun. 30, 2024 | ||||||||||||
| Bar Chart, Year to Date Return | rr_BarChartYearToDateReturn | 11.87% | ||||||||||||
| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best calendar quarter | ||||||||||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Jun. 30, 2020 | ||||||||||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 33.16% | ||||||||||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst calendar quarter | ||||||||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Jun. 30, 2022 | ||||||||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (21.54%) | ||||||||||||
| Performance Table Heading | rr_PerformanceTableHeading | Average annual total returns after sales charges (for periods ended 12/31/23) | ||||||||||||
| 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 |
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| Putnam Sustainable Future Fund | Russell 3000 Index (no deduction for fees, expenses or taxes) | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 25.96% | [1] | |||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 15.16% | [1] | |||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 11.48% | [1] | |||||||||||
| Putnam Sustainable Future Fund | Russell Midcap Growth Index (no deduction for fees, expenses or taxes) | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 25.87% | [1] | |||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 13.81% | [1] | |||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 10.57% | [1] | |||||||||||
| Putnam Sustainable Future Fund | Putnam Sustainable Future Linked Benchmark, (no deduction for fees, expenses or taxes) | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 25.87% | [1],[2] | |||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 13.81% | [1],[2] | |||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 9.50% | [1],[2] | |||||||||||
| Putnam Sustainable Future Fund | Class A | ||||||||||||||
| 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% | [3] | |||||||||||
| 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 | 0.25% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 1.05% | ||||||||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 676 | ||||||||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 890 | ||||||||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 1,121 | ||||||||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | $ 1,784 | ||||||||||||
| Annual Return 2014 | rr_AnnualReturn2014 | 10.67% | ||||||||||||
| Annual Return 2015 | rr_AnnualReturn2015 | (4.33%) | ||||||||||||
| Annual Return 2016 | rr_AnnualReturn2016 | 13.03% | ||||||||||||
| Annual Return 2017 | rr_AnnualReturn2017 | 10.64% | ||||||||||||
| Annual Return 2018 | rr_AnnualReturn2018 | (6.93%) | ||||||||||||
| Annual Return 2019 | rr_AnnualReturn2019 | 29.76% | ||||||||||||
| Annual Return 2020 | rr_AnnualReturn2020 | 52.74% | ||||||||||||
| Annual Return 2021 | rr_AnnualReturn2021 | 5.78% | ||||||||||||
| Annual Return 2022 | rr_AnnualReturn2022 | (33.93%) | ||||||||||||
| Annual Return 2023 | rr_AnnualReturn2023 | 28.60% | ||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 21.21% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 10.92% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.54% | ||||||||||||
| Putnam Sustainable Future Fund | Class A | After Taxes on Distributions | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 21.21% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 9.29% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 5.56% | ||||||||||||
| Putnam Sustainable Future Fund | Class A | After Taxes on Distributions and Sales | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 12.55% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 8.54% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 5.61% | ||||||||||||
| Putnam Sustainable Future Fund | Class B | ||||||||||||||
| 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% | [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 | 0.25% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 1.80% | ||||||||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 683 | ||||||||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 866 | ||||||||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 1,175 | ||||||||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,653 | ||||||||||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 183 | ||||||||||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 566 | ||||||||||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 975 | ||||||||||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,653 | ||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 22.69% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 11.16% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.76% | ||||||||||||
| Putnam Sustainable Future Fund | Class C | ||||||||||||||
| 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% | [5] | |||||||||||
| 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 | 0.25% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 1.80% | ||||||||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 283 | ||||||||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 566 | ||||||||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 975 | ||||||||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,919 | ||||||||||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 183 | ||||||||||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 566 | ||||||||||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 975 | ||||||||||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,919 | ||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 26.72% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 11.41% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.53% | ||||||||||||
| Putnam Sustainable Future Fund | Class R | ||||||||||||||
| 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 | 0.25% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 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 | 28.33% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 11.97% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.91% | ||||||||||||
| Putnam Sustainable Future Fund | Class R6 | ||||||||||||||
| 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 | 0.13% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 0.68% | ||||||||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 69 | ||||||||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 218 | ||||||||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 379 | ||||||||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | $ 847 | ||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 29.13% | [6] | |||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 12.67% | [6] | |||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 8.53% | [6] | |||||||||||
| Putnam Sustainable Future Fund | Class Y | ||||||||||||||
| 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 | 0.25% | ||||||||||||
| Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 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 | 28.99% | ||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 12.54% | ||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 8.46% | ||||||||||||
| Putnam Sustainable Future Fund | Risk Lose Money [Member] | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | It is important to understand that you can lose money by investing in the fund. | ||||||||||||
| Putnam Sustainable Future Fund | Risk Not Insured Depository Institution [Member] | ||||||||||||||
| Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. | ||||||||||||
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