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BNY MELLON ACTIVE MIDCAP FUND  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

December 1, 2020


BNY MELLON ACTIVE MIDCAP FUND


Supplement to Current Summary Prospectus and Prospectus
Risk/Return [Heading] rr_RiskReturnHeading BNY MELLON ACTIVE MIDCAP FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following information supersedes the 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 May 01, 2021
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.  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-years examples are based on net operating expenses, which reflect the expense limitation agreement by BNY Mellon Investment Adviser, Inc.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:
BNY MELLON ACTIVE MIDCAP FUND | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.13%
Total other expenses rr_OtherExpensesOverAssets 0.38%
Total annual fund operating expenses rr_ExpensesOverAssets 1.13%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.35%) [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.78%
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 $ 650
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 881
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,130
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,841
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 650
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 881
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,130
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,841
BNY MELLON ACTIVE MIDCAP 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_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.27%
Total other expenses rr_OtherExpensesOverAssets 0.52%
Total annual fund operating expenses rr_ExpensesOverAssets 2.02%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.35%) [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 270
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 600
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,056
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,320
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 170
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 600
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,056
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,320
BNY MELLON ACTIVE MIDCAP 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.18%
Total other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 0.93%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.35%) [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 261
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 480
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,111
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 59
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 261
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 480
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,111
BNY MELLON ACTIVE MIDCAP 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_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.09%
Total other expenses rr_OtherExpensesOverAssets 0.09%
Total annual fund operating expenses rr_ExpensesOverAssets 0.84%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.35%) [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.49%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 432
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,005
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 50
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 233
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 432
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,005
[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] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has contractually agreed to waive receipt of a portion of its management fee in the amount of .35% of the value of the fund's average daily net assets from December 1, 2020 until May 1, 2021. On or after May 1, 2021, BNY Mellon Investment Adviser, Inc. may terminate this waiver agreement at any time.