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

First Eagle Overseas Fund (“Overseas Fund” or the “Fund”) seeks long-term growth of capital by investing primarily in equities issued by non-U.S. corporations.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Overseas Fund
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 the Overseas 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, together with certain related accounts, invest, or agree to invest in the future, at least $25,000 in the Overseas Fund. 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 155 and 162, respectively, and in the appendix to this 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

The Overseas Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 8.99% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.99%
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 the Overseas Fund.
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 the Overseas Fund 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.
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To achieve its objective of long-term capital growth, the Overseas Fund will invest primarily in equity securities (e.g., common stocks) of non-U.S.

companies, the majority of which are traded in mature markets (for example, Canada, Japan, Germany and France), and may invest in countries whose economies are still developing (sometimes called “emerging markets”). The Fund particularly seeks companies that have financial strength and stability, strong management and fundamental value. Normally, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in foreign securities (including American Depositary Receipts, Global Depositary Receipts and European Depositary Receipts) and “counts” relevant derivative positions towards this “80% of assets” 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 Fund also may invest up to 20% of its total assets in debt instruments (e.g., notes and bonds). The Fund may invest in debt instruments generally without regard to their credit rating or time to maturity. 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 gold and other precious metals, and futures contracts related to precious metals.

The investment philosophy and strategy of the Overseas Fund 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.

The Fund makes some investments through a special purpose trading subsidiary (the “Subsidiary”) and may invest up to 25% of its total assets in the Subsidiary. The Subsidiary is a wholly-owned and controlled subsidiary of the Fund, organized under the laws of the Cayman Islands as an exempted company. Generally, the Subsidiary will invest in commodities and related instruments (primarily gold bullion and other precious metals and related futures contracts).

For more information about the Overseas Fund’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 the Overseas Fund. 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 the Overseas Fund, 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 the Fund invests, as well as economic, political, or social events in the United States or abroad. Markets may be volatile, and prices of individual securities and other investments, including those of a particular type, may decline significantly and rapidly in response to adverse issuer, political, regulatory, market, economic or other developments, public perceptions concerning these developments, and adverse investor sentiment or publicity. Recent market conditions and events, including a global public health crisis, wars and armed conflicts and actions taken by governments in response, may exacerbate volatility. Rapid changes in prices 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 price or time of its choosing and can result in losses. Changes in prices may be temporary or may last for extended periods.
 

•

  

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.
 

•

  

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.
 

•

  

Geographic Investment Risk — To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region. While the Fund reserves the right to dynamically allocate its assets across countries and regions, listed below are some of the geographies to which the Fund has significant exposure as of the date of this Prospectus.

     

Canada Risk — The Canadian economy is susceptible to adverse changes in certain commodities markets, including those related to the mining and agricultural industries. It is also heavily dependent on trading with key partners. Any reduction in this trading may adversely affect the Canadian economy.
     

European Risk — The Fund’s investments 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”) and the war in Ukraine. Investments in a single region, even though representing a number of different countries within the region, may be affected by common economic forces and other factors. Further, political or economic disruptions in European countries, even in countries in which the Fund is not invested, may adversely affect security values and thus the Fund’s holdings. The impact of Brexit on the United Kingdom and European economies could be significant, potentially resulting in increased volatility and illiquidity and lower economic growth for companies that rely significantly on the United Kingdom and/or Europe for their business activities and revenues. Any further exits from the European Union, or an increase in the belief that such exits are likely or possible, would likely cause additional market disruption globally and introduce new legal and regulatory uncertainties.
     

Japan Risk — The Japanese economy is heavily dependent upon international trade and may be subject to considerable degrees of economic, political and social instability, which could negatively affect the Fund. Japan has also experienced natural disasters, such as earthquakes and tidal waves, of varying degrees of severity, which also could negatively affect the Fund.
 

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Emerging Market Risk — When the Fund invests in emerging market securities (generally meaning those associated with less developed markets),

 

 

  

the Fund may be exposed to market, credit, currency, liquidity, legal, political, technical and other risks different from, and generally greater than, the risks of investing in developed markets. Emerging market countries typically have less-established market economies than developed countries and may face greater social, economic, regulatory and political uncertainties. In addition, emerging markets typically present greater illiquidity and price volatility concerns due to smaller or limited local capital markets and greater difficulty in determining market valuations of securities due to limited public information on issuers.
 

•

  

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.
 

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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.
 

•

  

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. As of the date of this Prospectus, there have been significant recent rates increases in the United States to combat inflation in the U.S. economy, and additional rate increases are possible.

 

•

  

Gold Risk — The Fund may invest in both physical gold and the securities of companies in the gold mining sector. Prices of gold-related issues are susceptible to changes in U.S. and foreign regulatory policies, taxes, currencies, mining laws, inflation, and various other market conditions. Gold-related investments as a group have not performed as well as the stock market in general during periods when the U.S. dollar is strong, inflation is low and general economic conditions are stable. In addition, returns on gold-related investments have traditionally been more volatile than investments in broader equity or debt markets.
 

•

  

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. To date, derivatives have been used mainly under a hedging program intended to reduce the impact of foreign exchange rate changes on the Fund’s value. 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.
 

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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.
 

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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.
 

•

  

Subsidiary Risk — By investing in the Subsidiary, the Fund is indirectly exposed to the risks associated with the Subsidiary’s investments. The Subsidiary is not registered under the 1940 Act and is not subject to all of the investor protections of the 1940 Act. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Fund and/or the Subsidiary to operate as expected and could adversely affect the Fund.

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 the Overseas Fund, 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 the Overseas Fund.
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

The following information provides an indication of the risks of investing in the Overseas Fund by showing changes in the Fund’s performance from year to year, and by showing how the Fund’s average annual returns for the periods shown compare with those of one or more broad measures of market performance, which have characteristics relevant to the Fund’s investment strategy. The index is described in the Fund Indices section. 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/overseas-fund 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 the Overseas Fund by showing changes in the Fund’s performance from year to year, and by showing how the Fund’s average annual returns for the periods shown compare with those of one or more broad measures of market performance, which have characteristics relevant to the Fund’s investment strategy.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.334.2143
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.firsteagle.com/overseas-fund
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 Closing [Text Block] rr_BarChartClosingTextBlock

 

 

 

 

 

 

 

 

 

Best Quarter*

 

 

  

Worst Quarter*

Second Quarter 2020

  

12.99%

 

 

  

First Quarter 2020

  

-17.70%

 

 

 

 

 

 

*

  

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, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.70%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees or expenses, but reflects net of withholding 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 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.
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, 2022
First Eagle Overseas Fund | 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%
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.15%
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.15%
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 $ 611
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 847
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,101
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,828
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 611
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 847
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,828
Annual Return 2013 rr_AnnualReturn2013 11.57%
Annual Return 2014 rr_AnnualReturn2014 (0.97%)
Annual Return 2015 rr_AnnualReturn2015 2.27%
Annual Return 2016 rr_AnnualReturn2016 5.59%
Annual Return 2017 rr_AnnualReturn2017 14.05%
Annual Return 2018 rr_AnnualReturn2018 (10.29%)
Annual Return 2019 rr_AnnualReturn2019 17.61%
Annual Return 2020 rr_AnnualReturn2020 6.95%
Annual Return 2021 rr_AnnualReturn2021 4.94%
Annual Return 2022 rr_AnnualReturn2022 (8.10%)
1 Year rr_AverageAnnualReturnYear01 (12.69%)
5 Years rr_AverageAnnualReturnYear05 0.67%
10 Years rr_AverageAnnualReturnYear10 3.47%
First Eagle Overseas Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (13.40%)
5 Years rr_AverageAnnualReturnYear05 (0.17%)
10 Years rr_AverageAnnualReturnYear10 2.59%
First Eagle Overseas Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (6.99%)
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 2.67%
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 292
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 594
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,021
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,212
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 192
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 594
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,021
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,212
1 Year rr_AverageAnnualReturnYear01 (9.69%)
5 Years rr_AverageAnnualReturnYear05 0.96%
10 Years rr_AverageAnnualReturnYear10 3.24%
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 284
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,096
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 91
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 284
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 493
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,096
1 Year rr_AverageAnnualReturnYear01 (7.89%)
5 Years rr_AverageAnnualReturnYear05 1.99%
10 Years rr_AverageAnnualReturnYear10 4.29%
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.30%
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 443
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,680
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 143
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 443
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 766
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,680
1 Year rr_AverageAnnualReturnYear01 (8.38%)
Since Inception rr_AverageAnnualReturnSinceInception 1.75%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2018
First Eagle Overseas Fund | Class R3 | MSCI EAFE Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (14.45%)
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 4.67%
Since Inception rr_AverageAnnualReturnSinceInception 1.50%
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2018
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.16%
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 (7.98%)
Since Inception rr_AverageAnnualReturnSinceInception 1.11%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 17, 2018
First Eagle Overseas Fund | Class R4 | MSCI EAFE Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (14.45%)
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 4.67%
Since Inception rr_AverageAnnualReturnSinceInception 1.54%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 17, 2018
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.42%
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 644
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,420
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 119
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 372
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 644
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,420
1 Year rr_AverageAnnualReturnYear01 (8.19%)
Since Inception rr_AverageAnnualReturnSinceInception 3.44%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 2019
First Eagle Overseas Fund | Class R5 | MSCI EAFE Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (14.45%)
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 4.67%
Since Inception rr_AverageAnnualReturnSinceInception 3.61%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 2019
First Eagle Overseas Fund | 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 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.05%
Total Annual Operating Expenses (%) 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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 255
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 444
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 990
1 Year rr_AverageAnnualReturnYear01 (7.78%)
5 Years rr_AverageAnnualReturnYear05 2.07%
Since Inception rr_AverageAnnualReturnSinceInception 3.28%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017
First Eagle Overseas Fund | Class R6 | MSCI EAFE Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (14.45%)
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 4.67%
Since Inception rr_AverageAnnualReturnSinceInception 4.51%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017