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Multi-class Prospectus | First Eagle High Yield Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading First Eagle High Yield Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

First Eagle High Yield Fund (“High Yield Fund”) seeks to provide investors with a high level of current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the High Yield Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following information describes the fees and expenses you may pay if you buy and hold shares of the High Yield Fund.


You may qualify for sales charge discounts if you, together with certain related accounts, invest, or agree to invest in the future, at least $100,000 in the High Yield 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 75 and 81, 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, 2019
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover Rate
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

There are transaction costs due to the bid/ask spread in the case of bonds or commissions in the case of stocks. The High Yield Fund pays transaction costs, such as commissions, when the Fund 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, affect the Fund’s performance. During the Fund’s most recent fiscal year, the Fund’s portfolio turnover rate was 25.77% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.77%
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 $100,000 in the High Yield Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
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 the High Yield 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 management fee waiver is taken into account only for the one-year expense example). Please keep in mind your actual costs may be higher or lower.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To pursue its investment objective, the High Yield Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in high yield, below investment-grade securities (commonly referred to as “junk bonds”) and instruments. Such high yield instruments may include corporate bonds and loans, municipal bonds, and mortgage-backed and asset-backed securities. The Fund may invest in, and count for the purposes of this 80% allotment, unrated securities or other instruments deemed by the Fund’s Adviser to be below investment grade. The Fund “counts” relevant derivative positions towards its “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 may invest its assets in the securities of both U.S. and foreign issuers. The Fund may also invest (typically for hedging purposes) in derivative instruments such as options, futures contracts and options on futures contracts, credit default swaps, and swaps and options on indices.


The Fund may invest in securities with any investment rating or time to maturity, as well as unrated securities. An investment in the Fund is not intended to be a complete investment program.
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 High Yield 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 Fund, which could adversely affect its net asset value and total return, are:


 

•

  

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. 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.
 

•

  

High Yield Risk — The Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) under normal market conditions in high yield instruments (commonly known as “junk bonds”) which may be subject to greater levels of interest rate, credit (including issuer default) and liquidity risk than investment grade securities and may experience extreme price fluctuations. The securities of such companies may be considered speculative and the ability of such companies to pay their debts on schedule may be uncertain.
 

•

  

Market Risk — The value 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.
 

•

  

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

•

  

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

•

  

Illiquid Investment Risk — Holding illiquid securities restricts or otherwise limits the ability for the Fund to freely dispose of its investments for specific periods of time. The Fund might not be able to sell illiquid securities at its desired price or time. Changes in the markets or in regulations governing the trading of illiquid instruments can cause rapid changes in the price or ability to sell an illiquid security. The market for lower-quality debt instruments, including junk bonds, is generally less liquid than the market for higher-quality debt instruments.

 

•

  

Prepayment Risk — Certain instruments, especially mortgage-backed securities, for example, are susceptible to the risk of prepayment by borrowers. During a period of declining interest rates, homeowners may refinance their high-rate mortgages and prepay the principal. Cash from these prepayments flows through to prepay the mortgage-backed securities, necessitating reinvestment in other assets, which may lower returns. Asset-backed securities, which are subject to risks similar to those of mortgage-backed securities, are also structured like mortgage-backed securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include such items as motor vehicle installment sales or installment loan contracts, leases of various types of real and personal property and receivables from credit card agreements. The market for mortgage-backed and asset-backed instruments may be volatile and limited, which may make them difficult to buy or sell.
 

•

  

Bank Loan Risk — The Fund may invest in bank loans. These investments potentially expose the Fund to the credit risk of the underlying borrower, and in certain cases, of the financial institution. The Fund’s ability to receive payments in connection with the loan depends primarily on the financial condition of the borrower. The market for bank loans may be illiquid and the Fund may have difficulty selling them, especially in the case of leveraged loans, which can be difficult to value. In addition, bank loans often have contractual restrictions on resale, which can delay the sale and adversely impact the sale price. At times, the Fund may decline to receive non-public information relating to loans, which could disadvantage the Fund relative to other investors.
 

•

  

Changes in Debt Ratings Risk — If a rating agency gives a debt instrument a lower rating, the value of the instrument may decline because investors may demand a higher rate of return.
 

•

  

Derivatives Risk — Futures contracts or other “derivatives,” including hedging strategies, present risks related to their significant price volatility and risk of default by the counterparty to the contract. The Fund may use derivatives in seeking to reduce the impact of foreign exchange rate changes on the Fund’s value. The Fund may at times also purchase derivatives linked to relevant market indices as either a hedge or for investment purposes.
 

•

  

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.

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 High Yield 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 High Yield Fund.
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 High Yield Fund commenced operations in its present form on or about December 30, 2011 and is the successor to the Old Mutual High Yield Fund (the “Predecessor Fund”) pursuant to a reorganization on or about that same date. The Predecessor Fund had similar investment objectives and strategies as the Fund, but was managed by another investment adviser.


The following information provides an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing how the Fund’s average annual returns for 1 and 5 years and since inception 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/high-yield-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 Fund by showing changes in the Fund’s performance from year to year, and by showing how the Fund’s average annual returns for 1 and 5 years and since inception 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/high-yield-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 I
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

  

24.95%

  

 

  

Fourth Quarter 2008

  

-10.60%

 

 

 

 

 

 

*

  

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 24.95%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.60%)
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 average annual total returns table discloses after-tax returns only for Class I shares. After-tax returns for Class A, Class C, Class R3, Class R4, Class R5 and Class R6 shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The following average annual total returns table discloses after-tax returns only for Class I shares. After-tax returns for Class A, Class C, Class R3, Class R4, Class R5 and Class R6 shares will vary. Returns shown for Class I shares assume commencement of operations on November 19, 2007, which is the date of organization of the Predecessor Fund. Returns shown for Class A and Class C assume commencement of operations on January 3, 2012, which is the date of inception for these share classes. Returns shown for Class I shares include the returns of the Predecessor Fund for periods prior to January 1, 2012. 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 High Yield Fund | Bloomberg Barclays U.S. Corporate High Yield Index (A Comparison)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.50%
5 Years rr_AverageAnnualReturnYear05 5.78%
10 Years rr_AverageAnnualReturnYear10 8.03%
Since Inception rr_AverageAnnualReturnSinceInception 7.28%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2012
Multi-class Prospectus | First Eagle High Yield Fund | Bloomberg Barclays U.S. Corporate High Yield Index (C Comparison)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.50%
5 Years rr_AverageAnnualReturnYear05 5.78%
10 Years rr_AverageAnnualReturnYear10 8.03%
Since Inception rr_AverageAnnualReturnSinceInception 7.28%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2012
Multi-class Prospectus | First Eagle High Yield Fund | Bloomberg Barclays U.S. Corporate High Yield Index (R6 Comparison)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.50%
5 Years rr_AverageAnnualReturnYear05 5.78%
10 Years rr_AverageAnnualReturnYear10 8.03%
Since Inception rr_AverageAnnualReturnSinceInception 4.20%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2017
Multi-class Prospectus | First Eagle High Yield Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) on Purchases (as a percentage of public offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
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 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.26% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 1.21%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 1.16%
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 $ 612
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 860
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,127
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,888
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 612
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 860
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,127
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,888
1 Year rr_AverageAnnualReturnYear01 (0.20%)
5 Years rr_AverageAnnualReturnYear05 2.79%
Since Inception rr_AverageAnnualReturnSinceInception 4.50%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2012
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.25% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 1.95%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 1.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 293
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 607
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,048
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,271
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 193
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 607
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,048
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,271
1 Year rr_AverageAnnualReturnYear01 2.80%
5 Years rr_AverageAnnualReturnYear05 2.96%
Since Inception rr_AverageAnnualReturnSinceInception 4.50%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 03, 2012
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.21% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 0.91%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 285
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 499
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,115
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 88
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 285
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 499
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,115
Annual Return 2008 rr_AnnualReturn2008 (15.70%)
Annual Return 2009 rr_AnnualReturn2009 60.00%
Annual Return 2010 rr_AnnualReturn2010 15.76%
Annual Return 2011 rr_AnnualReturn2011 4.08%
Annual Return 2012 rr_AnnualReturn2012 15.19%
Annual Return 2013 rr_AnnualReturn2013 6.92%
Annual Return 2014 rr_AnnualReturn2014 (0.24%)
Annual Return 2015 rr_AnnualReturn2015 (7.04%)
Annual Return 2016 rr_AnnualReturn2016 17.19%
Annual Return 2017 rr_AnnualReturn2017 4.86%
1 Year rr_AverageAnnualReturnYear01 4.86%
5 Years rr_AverageAnnualReturnYear05 4.03%
10 Years rr_AverageAnnualReturnYear10 8.60%
Multi-class Prospectus | First Eagle High Yield Fund | Class I | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.43%
5 Years rr_AverageAnnualReturnYear05 1.33%
10 Years rr_AverageAnnualReturnYear10 4.97%
Multi-class Prospectus | First Eagle High Yield Fund | Class I | After Taxes on Distributions and Sales of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.73%
5 Years rr_AverageAnnualReturnYear05 1.82%
10 Years rr_AverageAnnualReturnYear10 5.17%
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses rr_OtherExpensesOverAssets 0.27% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 1.32%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 413
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 719
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,586
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 129
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 413
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 719
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,586
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses rr_OtherExpensesOverAssets 0.27% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 1.07%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 335
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,301
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 104
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 335
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 585
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,301
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 0.97%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 304
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,185
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 94
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 304
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 531
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,185
Multi-class Prospectus | First Eagle High Yield 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_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.22% [3]
Total Annual Fund Operating Expenses (%) rr_ExpensesOverAssets 0.92%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses After Fee Waiver (%) rr_NetExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 89
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 288
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,127
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 89
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 288
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 504
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,127
Since Inception rr_AverageAnnualReturnSinceInception 3.23%
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] The Adviser has contractually agreed to waive its management fee at an annual rate in the amount of 0.05% of the average daily value of the Fund's net assets for the period through February 28, 2019. This waiver has the effect of reducing the management fee shown in the table for the term of the waiver from 0.70% to 0.65%.
[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.