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Label Element Value
BNY Mellon Small Cap Value Fund  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading BNY Mellon Small Cap Value Fund
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

Effective on or about October 1, 2025 (the "Effective Date"), the following information supersedes and replaces any contrary information in the sections "Fees and Expenses" in the fund's summary prospectus and "Fund Summary – Fees and Expenses" in the fund's prospectus:
Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_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 oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination Feb. 27, 2026
Expenses Deferred Charges [Text Block] oef_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 [Heading] oef_ExpenseExampleHeading Example
Supplement to Prospectus [Text Block] oef_SupplementToProspectusTextBlock

August 22, 2025

BNY MELLON INVESTMENT FUNDS I

-BNY Mellon Small Cap Value Fund

Supplement to Current Summary Prospectus and Prospectus
BNY Mellon Small Cap Value Fund | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Shareholder services fees oef_Component1OtherExpensesOverAssets 0.00% [1]
Miscellaneous other expenses oef_Component2OtherExpensesOverAssets 0.25% [1]
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.05% [1]
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.15%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.90% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 319
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 565
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,269
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 319
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 565
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,269
BNY Mellon Small Cap Value Fund | Class A  
Prospectus [Line Items] oef_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00% [3]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Shareholder services fees oef_Component1OtherExpensesOverAssets 0.25% [1]
Miscellaneous other expenses oef_Component2OtherExpensesOverAssets 0.34% [1]
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.39% [1]
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.15%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.24% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 694
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 976
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,278
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,135
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 694
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 976
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,278
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,135
BNY Mellon Small Cap Value Fund | Class C  
Prospectus [Line Items] oef_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.75%
Shareholder services fees oef_Component1OtherExpensesOverAssets 0.25% [1]
Miscellaneous other expenses oef_Component2OtherExpensesOverAssets 0.50% [1]
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.75%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 2.30% [1]
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.15%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 2.15% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 318
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 704
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,217
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,024
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 218
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 704
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,217
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,624
BNY Mellon Small Cap Value Fund | Class Y  
Prospectus [Line Items] oef_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Shareholder services fees oef_Component1OtherExpensesOverAssets 0.00% [1]
Miscellaneous other expenses oef_Component2OtherExpensesOverAssets 0.19% [1]
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.19%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.99% [1]
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.15%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.84% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 86
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 532
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,199
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 86
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 300
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 532
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,199
[1] "Other expenses," "Total annual fund operating expenses" and "Total annual fund operating expenses (after fee waiver)" have been restated to reflect the termination of the fund's fund accounting and administrative services agreement and the fee payable thereunder.
[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 .15% of the value of the fund's average daily net assets until February 27, 2026. On or after February 27, 2026, BNY Mellon Investment Adviser, Inc. may terminate this waiver agreement at any time.
[3] 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.