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First Eagle Fund of America  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading First Eagle Fund of America
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

First Eagle Fund of America (“Fund of America”) seeks capital appreciation and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund of America
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following information describes the fees and expenses you may pay if you buy, hold and sell shares of Fund of America. 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, together with certain related accounts, invest, or agree to invest in the future, at least $25,000 in Fund of America. Information about these and other discounts is available from your financial professional and in the How to Purchase Shares and Public Offering Price of Class A Shares sections on pages 140 and 147 respectively, and in the appendix to the Fund’s Prospectus titled Intermediary-Specific Front-End Sales Load and Waiver Terms.
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 Feb. 28, 2023
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover Rate
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Fund of America pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example above, affect the Fund’s performance. During the most recent fiscal year, Fund of America’s portfolio turnover rate was 40.70% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.70%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you, together with certain related accounts, invest, or agree to invest in the future, at least $25,000 in Fund of America.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in Fund of America with the cost of investing in other mutual funds. This hypothetical example assumes you invest $10,000 in the Fund for the time periods indicated and then either redeem or do not redeem all shares at the end of those periods. The example also assumes the average annual return is 5% and operating expenses remain the same (except that the fee waiver is taken into account only for the one-year expense example). Please keep in mind your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To achieve its objective of capital appreciation and current income, under normal circumstances Fund of America will primarily invest in domestic stocks and, to a lesser extent, debt and foreign equity instruments (including American Depositary Receipts, Global Depositary Receipts and European Depositary Receipts). Normally, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) are invested in domestic equity and debt instruments. Such investments include common stock, hybrid instruments such as preferred stock and convertible securities, warrants, corporate bonds, repurchase agreements, real estate investment trusts and derivatives. The Fund “counts” derivative positions on these instruments for purposes of this 80% allocation, and in doing so, values each position at the price at which it is held on the

Fund’s books (generally market price). At least 65% of the Fund’s net assets will be income-producing, including equity, hybrid, option and debt securities. That generally means that at least 65% of the Fund’s net assets (plus any borrowings for investment purposes) will be allocated to such investments that pay a dividend or other related income. In selecting companies for investment, the Adviser seeks to identify what it considers to be high quality companies. While a company selected for investment may not meet all of these characteristics, the Adviser considers a high quality company to demonstrate, in the opinion of the Adviser, some or all of the following: durable competitive advantage(s); conservative capital structure; prudent management; and attractive financial metrics.

Derivatives include investing in options, futures and swaps and related products. Specifically, the Fund may enter into interest rate, credit default, currency, equity, fixed income and index swaps and the purchase or sale of related caps, floors and collars.

In addition, the Fund may enter into options on securities and on stock indices to limit the Fund’s investment risk and augment its investment return only if at the time of writing, the Fund holds a portfolio of stocks or bonds listed on such index.

Further, the Fund may write “covered” call options on equity or debt securities and on stock indices in seeking to enhance investment return and to hedge against declines in the prices of portfolio securities. The Fund also may write put options to enhance investment return or to hedge against increases in the prices of securities which it intends to purchase. The Fund also may write call options on broadly based stock and bond market indices only if at the time of writing it holds a portfolio of stocks or bonds listed on such index to hedge against potential declines in prices. Finally, the Fund may utilize futures contracts, and options on futures, on securities exchanges or in the over-the-counter market.

The Fund may enter into certain types of repurchase agreements, primarily as a cash management strategy.

The investment philosophy and strategy of Fund of America can be broadly characterized as a “value” approach, as it seeks a “margin of safety” in each investment purchase with the goal being to avoid permanent impairment of capital (as opposed to temporary losses in share value relating to shifting investor sentiment or other normal share price volatility). In particular, a discount to “intrinsic value” is sought even for the best of businesses, with a deeper discount demanded for companies that we view as under business model, balance sheet, management or other stresses. “Intrinsic value” is based

on our judgment of what a prudent and rational business buyer would pay in cash for all of the company in normal markets. See also Defensive Investment Strategies.

Investment decisions for the Fund are made without regard to the capitalization (size) of the companies in which it invests. The Fund may invest in debt securities generally without regard to their credit rating or time to maturity. However, the Fund has no current intention of investing more than 5% of its net assets in debt instruments that are below investment grade (commonly referred to as “high yield” or “junk” bonds).

The Fund is a “non-diversified” fund. It generally invests a greater portion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund.

For more information about Fund of America’s principal investment strategies, please see the More Information about the Funds’ Investments section.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with any mutual fund investment, you may lose money by investing in Fund of America. The likelihood of loss may be greater if you invest for a shorter period of time. An investment in the Fund is not intended to be a complete investment program.

Principal risks of investing in Fund of America, which could adversely affect its net asset value and total return, are:

 

•

  

Market Risk — The value and liquidity of the Fund’s portfolio holdings may fluctuate in response to events specific to the companies or markets in which Fund of America invests, as well as economic, political, or social events in the United States or abroad. Markets can be volatile, and values of individual securities and other investments at times may decline significantly and rapidly. Recent market conditions and events, including a global public health crisis and actions taken by governments in response, may exacerbate volatility. Rapid changes in value or liquidity, which often are not anticipated and can relate to events not connected to particular investments, may limit the ability of the Fund to dispose of its assets at the value or time of its choosing and can result in losses.
 

•

  

Equity Risk — The value of the Fund’s portfolio holdings may fluctuate in response to the risk that the prices of equity securities, including common stock, rise and fall daily. These price movements may result from factors affecting individual companies, industries or the securities market as a whole. In addition, equity markets tend to move in cycles, which may cause

 

 

  

stock prices to fall over short or extended periods of time. Equity securities generally have greater price volatility than debt securities.
 

•

  

Preferred Stock Risk — The Fund may invest in preferred stock. Unlike common stock, preferred stock generally pays a fixed dividend from a company’s earnings and may have a preference over common stock on the distribution of a company’s assets in the event of bankruptcy or liquidation. Preferred stockholders’ liquidation rights are subordinate to the company’s debt holders and creditors. If interest rates rise, the fixed dividend on preferred stocks may be less attractive and the price of preferred stocks may decline.
 

•

  

Warrants Risk — The Fund may invest in warrants. Warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants do not necessarily move in tandem with the prices of the underlying securities and therefore are highly volatile and speculative investments.
 

•

  

Convertible Security Risk — Convertible securities generally offer lower interest or dividend yields than non-convertible securities of similar quality. Convertible securities may gain or lose value due to changes in the issuer’s operating results, financial condition, credit rating and changes in interest rates and other general economic, industry and market conditions.
 

•

  

Diversification Risk — The Fund is a non-diversified mutual fund, and as a result, an investment in Fund of America may expose your money to greater risks than if you invest in a diversified fund. Fund of America will invest in a limited number of companies and industries, therefore gains or losses in a particular security may have a greater impact on their share price.
 

•

  

Credit and Interest Rate Risk — The value of the Fund’s portfolio may fluctuate in response to the risk that the issuer of a bond or other instrument will not be able to make payments of interest and principal when due. The Fund may invest in debt instruments that are below investment grade, commonly known as “high yield” or “junk” bonds, which are considered speculative, and carry a higher risk of default. In addition, fluctuations in interest rates can affect the value of debt instruments held by the Fund. A debt instrument’s “duration” is a way of measuring a debt instrument’s sensitivity to a potential change in interest rates. An increase in interest rates tends to reduce the market value of debt instruments, while a decline in interest rates tends to increase their values. Generally, debt instruments with long maturities and low coupons have the longest durations. Longer-duration instruments tend to be more sensitive to interest rate changes than those with shorter durations. Recent market conditions

 

 

  

and events, including a global public health crisis and actions taken by governments in response, may exacerbate the risk that borrowers will not be able to make payments of interest and principal when due. In addition, there is risk of significant future rate moves and related economic and market impacts.
 

•

  

Corporate Bond Risk — The market value of a corporate bond may be affected by factors directly related to the issuer and by factors not directly related to the issuer, such as general market liquidity. The market value of corporate bonds generally may be expected to rise and fall inversely with interest rates, and as a result, corporate bonds may lose value in a rising-rate environment.
 

•

  

Dividend Risk — There is no guarantee that issuers of the securities held by the Fund will declare dividends in the future or that, if declared, they will be paid, or that they will either remain at current levels or increase over time.
 

•

  

Call Risk — The Fund may be subject to the risk that an issuer will exercise its right to pay principal on a debt obligation (such as a convertible security) that is held by the Fund earlier than expected. This may happen when there is a decline in interest rates. Under these circumstances, the Fund may be unable to recoup all of its initial investment and may also suffer from having to reinvest in lower-yielding securities.
 

•

  

Prepayment Risk — Certain instruments are susceptible to the risk of prepayment by borrowers. During a period of declining interest rates, borrowers may refinance high-rate debt and prepay the principal. Cash from these prepayments flows through to prepay securities, necessitating reinvestment in other assets, which may lower returns.
 

•

  

Small and Medium-Size Company Risk — The Fund may invest in small and medium-size companies, the securities of which can be more volatile in price than those of larger companies. Positions in smaller companies, especially when the Fund is a large holder of a small company’s securities, also may be more difficult or expensive to trade. The Fund considers small companies to be companies with market capitalizations of less than $1 billion and medium-size companies to have market capitalizations of less than $10 billion.
 

•

  

Large-Size Company Risk — The Fund may invest in larger, more established companies, the securities of which may be unable to respond quickly to new competitive challenges like changes in consumer tastes or innovative smaller competitors. Larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion. The Fund considers large companies to be companies with market capitalizations of $10 billion or greater.
 

•

  

Repurchase Agreements Risk — The Fund may enter into certain types of repurchase agreements, primarily as a cash management strategy. If the seller fails to repurchase the security and the market value declines, the Fund may lose money.
 

•

  

Derivatives Risk — Futures contracts or other “derivatives,” including hedging strategies, present risks related to their significant price volatility and risk of default by the counterparty to the contract. The Fund may use derivatives in seeking to reduce the impact of foreign exchange rate changes on the Fund’s value. The Fund may at times also purchase derivatives linked to relevant market indices as either a hedge or for investment purposes. A futures contract is considered a derivative because it derives its value from the price of the underlying security or financial index. The prices of futures contracts can be volatile and futures contracts may lack liquidity. In addition, there may be imperfect or even negative correlation between the price of a futures contract and the price of the underlying securities or financial index.
 

•

  

Options Risk — The Fund may engage in various options transactions in which the Fund seeks to limit investment risk or increase investment returns by purchasing the right to buy or sell, or by selling the obligation to buy or sell, a security at a set price in the future. The Fund pays a premium when buying options and receives a premium when selling options. When trading options, the Fund may incur losses or forego otherwise realizable gains if market prices do not move as expected.
 

•

  

Swaps Risk — Swap agreements (including interest rate, credit default, currency, equity, fixed income and index) are derivatives contracts where the parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments. In addition to the risks generally applicable to derivatives, risks associated with swap agreements include adverse changes in the returns of the underlying instruments, failure of the counterparties to perform under the agreement’s terms and the possible lack of liquidity with respect to the agreements.
 

•

  

Foreign Investment Risk — The Fund may invest in foreign investments (including American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”)). Foreign investments, which can be denominated in any applicable foreign currency, are susceptible to less politically, economically and socially stable environments, foreign currency and exchange rate changes, and adverse changes to government regulations. While depositary receipts provide an alternative to directly purchasing the underlying foreign securities in their respective national markets and currencies, investments in ADRs, GDRs and EDRs

 

 

  

continue to be subject to many of the risks associated with investing directly in foreign investments. The Fund’s investments also may subject it to the risks associated with investing in the European markets, including the risks associated with the United Kingdom’s exit from the European Union (“Brexit”).
 

•

  

Currency Risk — Currency risk is the risk that foreign currencies will decline in value relative to that of the U.S. dollar and affect the Fund’s non-U.S. currencies or securities that trade in and receive revenue in non-U.S. currencies.
 

•

  

Real Estate Industry Risk — The Fund may invest in real estate investment trusts (“REITs”), which are subject to risks affecting the real estate industry generally (including market conditions, competition, property obsolescence, changes in interest rates and casualty to real estate), as well as risks specifically affecting REITs (the quality and skill of REIT management and the internal expenses of the REIT).
 

•

  

Value Investment Strategy Risk — An investment made at a perceived “margin of safety” or “discount to intrinsic or fundamental value” can trade at prices substantially lower than when an investment is made, so that any perceived “margin of safety” or “discount to value” is no guarantee against loss. “Value” investments, as a category, or entire industries or sectors associated with such investments, may lose favor with investors as compared to those that are more “growth” oriented. In such an event, the Fund’s investment returns would be expected to lag relative to returns associated with more growth-oriented investment strategies. Investing in or having exposure to “value” securities presents the risk that such securities may never reach what the Adviser believes are their full market values.

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.

For more information on the risks of investing in Fund of America, please see the More Information about the Funds’ Investments section.
Risk Lose Money [Text] rr_RiskLoseMoney As with any mutual fund investment, you may lose money by investing in Fund of America.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is a non-diversified mutual fund, and as a result, an investment in Fund of America may expose your money to greater risks than if you invest in a diversified fund. Fund of America will invest in a limited number of companies and industries, therefore gains or losses in a particular security may have a greater impact on their share price.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Investment Results
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Effective August 14, 2020, the Fund changed its investment objective and principal investment strategy. Performance for the periods prior to August 14, 2020 shown below is based on the investment strategy utilized by the Fund at that time.

The following information provides an indication of the risks of investing in Fund of America by showing changes in the Fund’s performance from year to year,

and by showing how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance. As with all mutual funds, past performance is not an indication of future performance (before or after taxes).

After-tax returns are calculated using the highest individual U.S. federal income tax rate for each year, and do not reflect the effect of state and local taxes. Actual after-tax returns depend on your individual tax situation. After-tax returns are not relevant to investors in tax-deferred accounts, such as 401(k) plans or individual retirement accounts.

Updated performance information is available at www.firsteagle.com/fund-of-america or by calling 800.334.2143.

The following bar chart assumes reinvestment of dividends and distributions and does not reflect any sales charges. If sales charges were included, the returns would be lower.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides an indication of the risks of investing in Fund of America by showing changes in the Fund’s performance from year to year, and by showing how the Fund’s average annual returns for 1, 5 and 10 years compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.334.2143
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.firsteagle.com/fund-of-america
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance is not an indication of future performance (before or after taxes).
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns—Class A†
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The following bar chart assumes reinvestment of dividends and distributions and does not reflect any sales charges. If sales charges were included, the returns would be lower.
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock

 

†

  

Year-to-date performance as of October 31, 2021: 18.96%. The performance shown for all periods is the performance of Class A shares. Class Y shares converted to Class A shares on February 28, 2022.
 

*

  

For the period presented in the bar chart above.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

 

 

 

 

 

 

 

 

 

Best Quarter*

 

 

Worst Quarter*

First Quarter 2019

  

18.65%

  

 

First Quarter 2020

  

-23.72%

 

 

 

 
Year to Date Return, Label rr_YearToDateReturnLabel Year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Oct. 31, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 18.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.72%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual U.S. federal income tax rate for each year, and do not reflect the effect of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are not relevant to investors in tax-deferred accounts, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The following table discloses after-tax returns only for Class A shares. After-tax returns for Class C, Class I, Class R3, Class R4, Class R5 and Class R6 shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The following table discloses after-tax returns only for Class A shares.

After-tax returns for Class C, Class I, Class R3, Class R4, Class R5 and Class R6 shares will vary. While only partial information is shown for Class R3, Class R4, Class R5 and Class R6 shares (because they are more recently organized),

annual returns for Class R3, Class R4, Class R5 and Class R6 shares would have been substantially similar to those shown here. Class R3, Class R4, Class R5 and Class R6 shares are invested in the same portfolio of securities and the annual returns differ only to the extent that Class R3, Class R4, Class R5 and Class R6 shares do not have the same expenses as the classes for which more extended performance is shown. Comparative expense information is in the Fees and Expenses table.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of December 31, 2021
First Eagle Fund of America | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [1]
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.29% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.04%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.90%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% may apply on certain redemptions of Class A shares made within 18 months following a purchase of $1,000,000 or more without an initial sales charge.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 587
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 801
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,032
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,695
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 587
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 801
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,032
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,695
Annual Return 2012 rr_AnnualReturn2012 21.16%
Annual Return 2013 rr_AnnualReturn2013 31.07%
Annual Return 2014 rr_AnnualReturn2014 10.32%
Annual Return 2015 rr_AnnualReturn2015 (3.53%)
Annual Return 2016 rr_AnnualReturn2016 (1.97%)
Annual Return 2017 rr_AnnualReturn2017 21.79%
Annual Return 2018 rr_AnnualReturn2018 (23.84%)
Annual Return 2019 rr_AnnualReturn2019 28.32%
Annual Return 2020 rr_AnnualReturn2020 7.45%
Annual Return 2021 rr_AnnualReturn2021 20.29%
1 Year rr_AverageAnnualReturnYear01 16.37%
5 Years rr_AverageAnnualReturnYear05 7.88%
10 Years rr_AverageAnnualReturnYear10 9.24%
First Eagle Fund of America | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.36%
5 Years rr_AverageAnnualReturnYear05 4.58%
10 Years rr_AverageAnnualReturnYear10 7.09%
First Eagle Fund of America | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.16%
5 Years rr_AverageAnnualReturnYear05 5.37%
10 Years rr_AverageAnnualReturnYear10 7.02%
First Eagle Fund of America | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.29% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.79%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 550
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 957
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,094
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 550
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 957
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,094
1 Year rr_AverageAnnualReturnYear01 18.42%
5 Years rr_AverageAnnualReturnYear05 8.18%
10 Years rr_AverageAnnualReturnYear10 8.98%
First Eagle Fund of America | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 0.70%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 219
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 866
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 219
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 385
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 866
1 Year rr_AverageAnnualReturnYear01 20.57%
5 Years rr_AverageAnnualReturnYear05 9.31%
Since Inception rr_AverageAnnualReturnSinceInception 8.19%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 08, 2013
First Eagle Fund of America | Class I | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Since Inception rr_AverageAnnualReturnSinceInception 15.87%
First Eagle Fund of America | Class R3  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.27% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.12%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 344
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 605
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,352
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 344
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 605
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,352
1 Year rr_AverageAnnualReturnYear01 20.15%
Since Inception rr_AverageAnnualReturnSinceInception 7.47%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2018
First Eagle Fund of America | Class R3 | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Since Inception rr_AverageAnnualReturnSinceInception 19.50%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2018
First Eagle Fund of America | Class R4  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.48% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.08%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.33%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 311
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,287
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 311
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 563
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,287
1 Year rr_AverageAnnualReturnYear01 20.43%
Since Inception rr_AverageAnnualReturnSinceInception 12.60%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 29, 2019
First Eagle Fund of America | Class R4 | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Since Inception rr_AverageAnnualReturnSinceInception 22.65%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 29, 2019
First Eagle Fund of America | Class R5  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.85% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.35%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.70%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 672
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,563
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 359
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 672
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,563
1 Year rr_AverageAnnualReturnYear01 20.55%
Since Inception rr_AverageAnnualReturnSinceInception 12.72%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 29, 2019
First Eagle Fund of America | Class R5 | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Since Inception rr_AverageAnnualReturnSinceInception 22.65%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 29, 2019
First Eagle Fund of America | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.17% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 0.67%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 212
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 371
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 833
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 212
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 371
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 833
1 Year rr_AverageAnnualReturnYear01 20.57%
Since Inception rr_AverageAnnualReturnSinceInception 7.92%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017
First Eagle Fund of America | Class R6 | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 28.71%
5 Years rr_AverageAnnualReturnYear05 18.47%
10 Years rr_AverageAnnualReturnYear10 16.55%
Since Inception rr_AverageAnnualReturnSinceInception 17.73%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017
[1] A contingent deferred sales charge of 1.00% may apply on certain redemptions of Class A shares made within 18 months following a purchase of $1,000,000 or more without an initial sales charge.
[2] First Eagle Investment Management, LLC (the “Adviser”) has contractually agreed to waive and/or reimburse certain fees and expenses of Classes A, C, I, R3, R4, R5 and R6 so that the total annual operating expenses (excluding interest, taxes, brokerage commissions, acquired fund fees and expenses, dividend and interest expenses relating to short sales, and extraordinary expenses, if any) (“annual operating expenses”) of each class are limited to 0.90%, 1.65%, 0.65%, 1.00%, 0.75%, 0.65% and 0.65% of average net assets, respectively. Each of these undertakings lasts until February 28, 2023 and may not be terminated during its term without the consent of the Board of Trustees. The Fund has agreed that each of Classes A, C, I, R3, R4, R5 and R6 will repay the Adviser for fees and expenses waived or reimbursed for the class provided that repayment does not cause annual operating expenses (after the repayment is taken into account) to exceed either: (1) 0.90%, 1.65%, 0.65%, 1.00%, 0.75%, 0.65% and 0.65% of the class’ average net assets, respectively; or (2) if applicable, the then-current expense limitations. Any such repayment must be made within three years after the year in which the Adviser incurred the expense.
[3] “Other Expenses” shown generally reflect actual expenses for the Fund for the fiscal year ended October 31, 2021.