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Multi-class Prospectus | 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 by investing primarily in domestic stocks and, to a lesser extent, in debt and foreign equity securities.
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 and hold shares of Fund of America.


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 75 and 81, 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)
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 of America operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, Fund of America’s portfolio turnover rate was 57.02% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.02%
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
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” shown generally reflect actual expenses for the Fund for the fiscal year ended October 31, 2017 and estimated expenses in the case of newly organized share classes.
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. 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, Fund of America will primarily invest in domestic stocks and, to a lesser extent, debt and foreign equity instruments. Normally, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) are invested in domestic equity and debt instruments. Equity securities include common stocks, preferred stocks, convertible securities and warrants. The Fund may also invest in repurchase agreements and derivatives.


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. Further, the Fund may write “covered” call options on equity or debt securities and on stock indices in seeking to enhance investment return or to hedge against declines in the prices of portfolio securities or may write put options 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 if at the time of writing it holds a portfolio of stocks or bonds listed on such index. 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.


Normally, at least 80% of the Fund’s net assets (plus any borrowings for investment purposes) will be invested in domestic equity and debt instruments. 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).


The investment philosophy and strategy of Fund of America can be broadly characterized as a bottom-up, event-driven approach to choose securities that the Fund believes are undervalued and should perform well. In a bottom-up approach, companies and securities are researched and chosen individually. In an event-driven approach, one looks for companies that appear to be undervalued in relation to their potential value in light of positive corporate changes. Signals of corporate change can be management changes, large share repurchases, potential acquisitions or mergers. If changes are successful, these companies should realize a rise in the stock price. Fund of America invests in the securities of companies that it believes are undervalued relative to their overall financial and managerial strength. 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 any size company, including large, medium and smaller companies. 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 high yield bonds.
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 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.
 

•

  

Event-Driven Style Risk — The event-driven investment style carries the additional risk that the event anticipated occurs later than expected, does not occur at all, or does not have the desired effect on the market price of the securities.
 

•

  

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, e.g., 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. 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. Longer-duration instruments tend to be more sensitive to interest rate changes than those with shorter durations.
 

•

  

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.
 

•

  

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.
 

•

  

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.
 

•

  

Foreign Investment Risk — The Fund may invest in foreign investments. Foreign investments are susceptible to less politically, economically and socially stable environments, foreign currency and exchange rate changes, and adverse changes to government regulations.

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 Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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

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 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.feim.com/individual-investors/fund/fund-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.feim.com/individual-investors/fund/fund-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 Y
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 Closing [Text Block] rr_BarChartClosingTextBlock

 

 

 

 

 

 

 

 

 

Best Quarter*

 

 

  

Worst Quarter*

Second Quarter 2009

  

13.03%

  

 

  

Fourth Quarter 2008

  

-20.71%

 

 

 

 

 

 

*

  

For the period presented in the bar chart above.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.03%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.71%)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest individual 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 Y shares. After-tax returns for Class C, Class A, 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 Y shares.


After-tax returns for Class C, Class A, Class I, Class R3, Class R4, Class R5 and Class R6 shares will vary. While no or only partial year information is shown for Class R3, Class R4, Class R5 and Class R6 shares (because they have no or less than a full year’s performance as of December 31, 2017), 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 performance is shown. Comparative expense information is in the Fees and Expenses table.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of December 31, 2017
Multi-class Prospectus | First Eagle Fund of America | Standard & Poor’s 500 Index (I Comparison)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
Since Inception rr_AverageAnnualReturnSinceInception 14.28%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 08, 2013
Multi-class Prospectus | First Eagle Fund of America | Standard & Poor’s 500 Index (R6 Comparison)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 15.79%
10 Years rr_AverageAnnualReturnYear10 8.50%
Since Inception rr_AverageAnnualReturnSinceInception 13.43%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther 1.00% [1]
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.16% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.31%
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 $ 627
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 894
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,182
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,000
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 627
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 894
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,182
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,000
1 Year rr_AverageAnnualReturnYear01 15.68%
5 Years rr_AverageAnnualReturnYear05 9.60%
10 Years rr_AverageAnnualReturnYear10 7.24%
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.16% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 2.06%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 309
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 646
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,108
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,390
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 209
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 646
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,108
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,390
1 Year rr_AverageAnnualReturnYear01 19.83%
5 Years rr_AverageAnnualReturnYear05 9.90%
10 Years rr_AverageAnnualReturnYear10 6.98%
Multi-class Prospectus | First Eagle Fund of America | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [4]
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of your purchase or redemption price) rr_MaximumDeferredSalesChargeOverOther none [4]
Management Fees rr_ManagementFeesOverAssets 0.90% [2],[4]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [4]
Other Expenses rr_OtherExpensesOverAssets 0.16% [3],[4]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.31% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,579
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 133
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 415
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 718
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,579
Annual Return 2008 rr_AnnualReturn2008 (30.74%)
Annual Return 2009 rr_AnnualReturn2009 26.13%
Annual Return 2010 rr_AnnualReturn2010 21.33%
Annual Return 2011 rr_AnnualReturn2011 (1.01%)
Annual Return 2012 rr_AnnualReturn2012 21.16%
Annual Return 2013 rr_AnnualReturn2013 31.04%
Annual Return 2014 rr_AnnualReturn2014 10.32%
Annual Return 2015 rr_AnnualReturn2015 (3.54%)
Annual Return 2016 rr_AnnualReturn2016 (1.97%)
Annual Return 2017 rr_AnnualReturn2017 21.77%
1 Year rr_AverageAnnualReturnYear01 21.77%
5 Years rr_AverageAnnualReturnYear05 10.73%
10 Years rr_AverageAnnualReturnYear10 7.78%
Multi-class Prospectus | First Eagle Fund of America | Class Y | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 19.14%
5 Years rr_AverageAnnualReturnYear05 9.31%
10 Years rr_AverageAnnualReturnYear10 6.82%
Multi-class Prospectus | First Eagle Fund of America | Class Y | After Taxes on Distributions and Sales of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.44%
5 Years rr_AverageAnnualReturnYear05 8.39%
10 Years rr_AverageAnnualReturnYear10 6.18%
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.11% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 103
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 322
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,236
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 103
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 322
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 558
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,236
1 Year rr_AverageAnnualReturnYear01 22.14%
Since Inception rr_AverageAnnualReturnSinceInception 9.77%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 08, 2013
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.22% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.47%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 150
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 465
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 803
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,757
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 150
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 465
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 803
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,757
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.22% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.22%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 124
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 387
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 670
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,477
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 124
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 387
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 670
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,477
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.22% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 114
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 356
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 617
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,363
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 114
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 356
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 617
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,363
Multi-class Prospectus | 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.90% [2]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.10% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,225
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 318
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 552
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,225
Since Inception rr_AverageAnnualReturnSinceInception 12.98%
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] 0.90% of the first $2.25 billion of the Fund's average daily net assets, 0.85% of the next $2.75 billion of average daily net assets, and 0.80% of average daily net assets in excess of $5 billion.
[3] "Other Expenses" shown generally reflect actual expenses for the Fund for the fiscal year ended October 31, 2017 and estimated expenses in the case of newly organized share classes.
[4] Closed to new investors.