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First Eagle U.S. Smid Cap Opportunity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading First Eagle U.S. Smid Cap Opportunity Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

First Eagle U.S. Smid Cap Opportunity Fund (“Smid Cap Fund” or the “Fund”) seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Smid Cap 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 Smid Cap 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 Smid Cap 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 192 and 199, 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Feb. 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover Rate
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Smid Cap 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 Smid Cap Fund’s portfolio turnover rate was 30.48% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 30.48%
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 Smid Cap Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees “Other Expenses” and Acquired Fund Fees and Expenses (“AFFE”) are based on an estimate for the current fiscal year; actual expenses may vary. AFFE are fees and expenses incurred by the Fund in connection with its investments in other investment companies. Total Annual Operating Expenses shown will not correlate to the Fund’s ratio of expenses to average net assets appearing in the Financial Highlights table, which does not include AFFE.
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 Smid Cap 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 (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.
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests, under normal circumstances, in equity securities of small-and mid-cap (“smid cap”) companies in an attempt to take advantage of what the Adviser believes are opportunistic situations for undervalued securities. Normally, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in the equity securities (e.g., common stocks, warrants, rights and preferred stocks) of U.S. smid cap companies. The Adviser defines smid cap companies as those that have at the time of investment a market capitalization not greater than that of the largest company in the Russell 2500TM Index. The Russell 2500TM Index is reconstituted annually. As of December 31, 2023, the market capitalization range of the companies included within the Russell 2500TM Index was between $22.3 billion and $17 million.

Potential investments that the Adviser considers to be opportunistic may include situations involving company turnarounds (e.g., a company that may be experiencing periods of poor financial or stock performance but may be exhibiting potential for financial recovery), emerging growth companies with interrupted earnings patterns (e.g., companies without a long or consistent history of earnings but that the Adviser believes have the potential for earnings growth), companies with unrecognized asset values, or undervalued growth companies (e.g., companies that have low multiples of price-to book or price-to sales ratios, or companies with securities that are trading at a price below what the Adviser believes the security is worth). The Adviser also considers investments in companies that have the potential to benefit from a perceived catalyst for positive change, such as companies with new management, a more favorable business cycle, product innovation and/or margin improvement. In certain market environments, the Fund may invest up to 10% of its net assets (plus any borrowings for investment purposes and measured at the time of investment) in foreign investments (including American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”)).

The Fund may invest in other investment companies (e.g., exchange-traded funds) that invest in equity securities. The Fund may sell securities to, among other things, secure gains, limit losses, redeploy assets into what the Adviser deems to be more promising opportunities, and/or manage cash levels in the Fund’s portfolio. In managing the Fund’s assets, the Adviser uses various methods of analysis primarily rooted in drawing a view on the valuation of each security and a related evaluation of each company. In selecting securities for

the Fund, the Adviser generally evaluates the quality of a company’s balance sheet and other measures of a company’s financial condition and profitability, such as the history and/or potential for improvement in cash flow generation, internal rates of return, and sustainable earnings. The Adviser generally seeks to invest in equity securities of companies that are trading below the Adviser’s estimate of the company’s current worth in an attempt to reduce the risk of overpaying for such securities.

For more information about the Smid Cap Fund’s principal investment strategies, please see the More Information about the Funds’ Investments section.
Risk [Heading] rr_RiskHeading Principal Investment Risks
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 Smid Cap 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 indices are 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/us-smid-cap-opportunity-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 Smid Cap 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/us-smid-cap-opportunity-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*

Fourth Quarter 2023

  

11.28%

  

 

  

Third Quarter 2023

  

-6.81%

 

 

 

 

 

 

*

  

For the period presented in the bar chart above.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2023
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.81%)
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 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 I 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 I and Class R6 shares will vary.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of December 31, 2023
First Eagle U.S. Smid Cap Opportunity Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock As with any mutual fund investment, you may lose money by investing in the Smid Cap Fund.
First Eagle U.S. Smid Cap Opportunity Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market Risk — The value and liquidity of the Fund’s portfolio holdings may fluctuate in response to events specific to the issuers 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.
First Eagle U.S. Smid Cap Opportunity Fund | Small and Medium-Size Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Small and Medium-Size Company Risk — The Fund will 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 and medium-size companies to be companies with market capitalizations that have at the     time of investment a market capitalization not greater than that of the largest company in the Russell 2500TM Index
First Eagle U.S. Smid Cap Opportunity Fund | Equity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
First Eagle U.S. Smid Cap Opportunity Fund | Preferred Stock Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
First Eagle U.S. Smid Cap Opportunity Fund | Warrants and Rights Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Warrants and Rights Risk — The Fund may invest in warrants and rights. Warrants and rights can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants and rights do not necessarily move in tandem with the prices of the underlying securities and therefore are highly volatile and speculative investments.
First Eagle U.S. Smid Cap Opportunity Fund | Foreign Investment Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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 are susceptible to less politically, economically and socially stable environments 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 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. 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.
First Eagle U.S. Smid Cap Opportunity Fund | Other Investment Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Other Investment Company Risk — To the extent the Fund invests in other investment companies, including money market funds and exchange-traded funds (“ETFs”), its performance will be affected by the performance of those other investment companies. Investments in other investment companies are subject to the risks of the other investment companies’ investments. In addition, the Fund will pay a proportional share of the fees and expenses of the other investment companies in addition to its own fees and expenses and, as a result, shareholders will be subject to two layers of fees and expenses.
First Eagle U.S. Smid Cap Opportunity Fund | New Fund Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock New Fund Risk — The Fund may not be successful in implementing its investment strategy, and its investment strategy may not be successful under all future market conditions, either of which could result in the Fund being liquidated at some future time without shareholder approval and/or at a time that may not be favorable for certain shareholders. New funds may not attract sufficient assets to achieve investment, trading or other efficiencies.
First Eagle U.S. Smid Cap Opportunity Fund | Cybersecurity Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Cybersecurity Risk — The occurrence of a disaster such as a cyber-attack, a natural catastrophe, an industrial accident, a terrorist attack or war, events unanticipated in the disaster recovery systems of the Fund and Adviser, or a support failure from external providers, could have an adverse effect on the Fund’s ability to conduct business and on its results of operations and financial condition, particularly if those events affect the Fund and/or the Adviser’s computer-based data processing, transmission, storage, and retrieval systems or destroy data.
First Eagle U.S. Smid Cap Opportunity Fund | Value Investment Strategy Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Value Investment Strategy Risk — “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.
First Eagle U.S. Smid Cap Opportunity Fund | Risk Not Insured [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock 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.
First Eagle U.S. Smid Cap Opportunity 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% [1]
Management Fees rr_ManagementFeesOverAssets 0.75% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_Component3OtherExpensesOverAssets 6.08% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 7.09%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (5.88%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 1.21%
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 $ 617
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,986
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,299
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 6,347
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 617
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,986
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,299
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 6,347
Annual Return 2023 rr_AnnualReturn2023 17.19%
1 Year rr_AverageAnnualReturnYear01 11.28%
Since Inception rr_AverageAnnualReturnSinceInception (1.09%)
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.77%
Since Inception rr_AverageAnnualReturnSinceInception (1.44%)
First Eagle U.S. Smid Cap Opportunity Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.99%
Since Inception rr_AverageAnnualReturnSinceInception (0.85%)
First Eagle U.S. Smid Cap Opportunity Fund | Class A | Russell 2500TM Value Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.98%
Since Inception rr_AverageAnnualReturnSinceInception 1.97%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class A | Russell 2500TM Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.42%
Since Inception rr_AverageAnnualReturnSinceInception (1.27%)
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class A | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.29%
Since Inception rr_AverageAnnualReturnSinceInception 5.93%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity 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% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_Component3OtherExpensesOverAssets 2.21% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 2.97%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.01%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 729
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,146
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 98
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 729
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,385
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,146
1 Year rr_AverageAnnualReturnYear01 17.53%
Since Inception rr_AverageAnnualReturnSinceInception 3.04%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class I | Russell 2500TM Value Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.98%
Since Inception rr_AverageAnnualReturnSinceInception 3.61%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class I | Russell 2500TM Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.42%
Since Inception rr_AverageAnnualReturnSinceInception 0.77%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class I | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.29%
Since Inception rr_AverageAnnualReturnSinceInception 8.57%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity 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% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_Component3OtherExpensesOverAssets 8.21% [3]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total Annual Operating Expenses (%) rr_ExpensesOverAssets 8.97%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (8.01%) [2]
Total Annual Operating Expenses After Fee Waiver and/or Expense Reimbursement (%) rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,891
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,545
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 7,137
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 98
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,891
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 3,545
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 7,137
1 Year rr_AverageAnnualReturnYear01 17.45%
Since Inception rr_AverageAnnualReturnSinceInception 2.96%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class R6 | Russell 2500TM Value Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.98%
Since Inception rr_AverageAnnualReturnSinceInception 1.97%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class R6 | Russell 2500TM Index (reflects no deduction for fees or expenses, but reflects net of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 17.42%
Since Inception rr_AverageAnnualReturnSinceInception (1.27%)
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
First Eagle U.S. Smid Cap Opportunity Fund | Class R6 | S&P 500 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 26.29%
Since Inception rr_AverageAnnualReturnSinceInception 5.93%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 15, 2022
[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, I and R6 so that the total annual
[3] “Other Expenses” and Acquired Fund Fees and Expenses (“AFFE”) are based on an estimate for the current fiscal year; actual expenses may vary. AFFE are fees and expenses incurred by the Fund in connection with its investments in other investment companies. Total Annual Operating Expenses shown will not correlate to the Fund’s ratio of expenses to average net assets appearing in the Financial Highlights table, which does not include AFFE.