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Class A, C, I and Y Prospectus | Dreyfus International Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000053808_SupplementTextBlock

November 1, 2017


THE DREYFUS/LAUREL FUNDS TRUST


Dreyfus International Bond Fund


(Class A, C, I and Y Shares)


Supplement to Summary Prospectus and Prospectus


Dated March 1, 2017
Risk/Return [Heading] rr_RiskReturnHeading Dreyfus International Bond Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following information supersedes and replaces any contrary information contained in “Fees and Expenses” in the fund’s summary prospectus and “Fund Summary - Fees and Expenses” in the fund’s prospectus:
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 that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 01, 2019
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current management fee.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same.  The one-year example and the first year of the three-, five- and ten-year examples are based on net operating expenses, which reflect the expense limitation agreement by The Dreyfus Corporation. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Class A, C, I and Y Prospectus | Dreyfus International Bond Fund | Dreyfus International Bond Fund - Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.63%
Total annual fund operating expenses rr_ExpensesOverAssets 1.13%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.02%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 549
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 783
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,034
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,753
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 549
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 783
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,034
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,753
Class A, C, I and Y Prospectus | Dreyfus International Bond Fund | Dreyfus International Bond Fund - Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.43%
Total annual fund operating expenses rr_ExpensesOverAssets 1.68%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 271
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 530
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 913
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,987
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 271
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 530
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 913
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,987
Class A, C, I and Y Prospectus | Dreyfus International Bond Fund | Dreyfus International Bond Fund - Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.65%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 810
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 66
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 208
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 362
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 810
Class A, C, I and Y Prospectus | Dreyfus International Bond Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.50% [2]
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.07%
Total annual fund operating expenses rr_ExpensesOverAssets 0.57%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 183
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 318
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 714
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 58
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 183
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 318
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 714
[1] Class A shares bought without an initial sales charge as part of an investment of $1 million or more may be charged a deferred sales charge of 1.00% if redeemed within one year.
[2] Restated to reflect current management fee.
[3] The fund's investment adviser, The Dreyfus Corporation, has contractually agreed, until March 1, 2019, to waive receipt of its fees and/or assume the direct expenses of the Class A shares of the fund so that the expenses of such Class A shares (excluding shareholder services fees, taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed .77%. On or after March 1, 2019, The Dreyfus Corporation may terminate this expense limitation at any time.