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BNY Mellon Small Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the 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 and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge. More information about sales charges, including these and other discounts and waivers, is available from your financial professional and in the Shareholder Guide section beginning on page 12 of the prospectus, in the Appendix on page A-1 of the prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section beginning on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information.
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 Feb. 01, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 most recent fiscal year, the fund's portfolio turnover rate was 79.73% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 79.73%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the fund or shares of other funds in the BNY Mellon Family of Funds that are subject to a sales charge.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 for Class Y 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:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of small-cap U.S. companies. The fund currently considers small-cap companies to be those with total market capitalizations that are equal to or less than the total market capitalization of the largest company included in the Russell 2000® Value Index (the Index), the fund's benchmark index. As of December 31, 2020, the market capitalization of the largest company in the Index was approximately $15.47 billion.

The fund's portfolio managers use fundamental research and qualitative analysis to select stocks among the portfolio candidates. The portfolio managers look for companies with strong competitive positions, high quality management, and financial strength.

The portfolio managers use a variety of screening methods to identify small-cap companies that might be attractive investments. Once attractive investments have been identified, the portfolio managers then use a consistent three-step fundamental research process to evaluate the stocks, consisting of:

● Valuation: to identify small-cap companies that are considered to be attractively priced relative to their earnings potential;

● Fundamentals: to verify the strength of the underlying business position; and

● Catalyst: to identify a specific event that has the potential to cause the stocks to appreciate in value.

The portfolio managers focus primarily on individual stock selection instead of trying to predict which industries or sectors will perform best. The stock selection process is designed to produce a diversified portfolio of companies that the portfolio managers believe are undervalued relative to expected business growth.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money.

● Risks of stock investing. Stocks generally fluctuate more in value than bonds and may decline significantly over short time periods. There is the chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The market value of a stock may decline due to general market conditions or because of factors that affect the particular company or the company's industry.

● Small and midsize company risk. Small and midsize companies carry additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be

experiencing significant losses), and their share prices more volatile than those of larger, more established companies. The shares of smaller companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the fund's ability to sell these securities.

● Value stock risk. Value stocks involve the risk that they may never reach their expected full market value, either because the market fails to recognize the stock's intrinsic worth or the expected value was misgauged.

● Market risk. The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments, and developments that impact specific economic sectors, industries or segments of the market.  In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed income markets may negatively affect many issuers, which could adversely affect the fund.  Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.  These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies world-wide.  Recent examples include pandemic risks related to COVID-19 and aggressive measures taken world-wide in response by governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines of large populations, and by businesses, including changes to operations and reducing staff. 

● Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically. Investments that are illiquid or that trade in lower volumes may be more difficult to value.

● Management risk. The investment process used by the fund's portfolio managers could fail to achieve the fund's investment goal and cause your fund investment to lose value.

Risk Lose Money [Text] rr_RiskLoseMoney The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the fund is not a bank deposit. It 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 Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Class I shares from year to year. Sales charges, if any, are not reflected in the bar chart, and if those charges were included, returns would have been less than those shown. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www. im.bnymellon.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www. im.bnymellon.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%)Class I
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges, if any, are not reflected in the bar chart, and if those charges were included, returns would have been less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter
Q4, 2020: 34.97%
Worst Quarter
Q1, 2020: -34.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 34.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (34.69%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deductions for fees, expenses or taxes
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is shown only for Class I shares. After-tax performance of the fund's other share classes will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund’s shares at the end of a period.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

After-tax performance is shown only for Class I shares. After-tax performance of the fund's other share classes will vary. After-tax returns are calculated using the historical highest individual federal marginal income tax rates, and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund’s shares at the end of a period.

For the fund's Class A, C and Y shares, periods prior to the inception date reflect the performance of the fund's Class I shares adjusted to reflect any applicable sales charges. Such performance figures have not been adjusted to reflect applicable class fees and expenses; if such fees and expenses had been reflected, the performance shown for Class A and C shares for such periods would have been lower. Each share class is invested in the same portfolio of securities and the

annual returns would have differed only to the extent that the classes have different expenses.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/20)
BNY Mellon Small Cap Value Fund | Russell 2000® Value Index reflects no deductions for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.63%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.65%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.66%
BNY Mellon Small Cap Value 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 0.80%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Administration fees rr_Component2OtherExpensesOverAssets 0.06%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.31%
Total other expenses rr_OtherExpensesOverAssets 0.62%
Total annual fund operating expenses rr_ExpensesOverAssets 1.42%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.42%
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 $ 711
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 998
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,307
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,179
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 711
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 998
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,307
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,179
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.03%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.86%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2016
BNY Mellon Small Cap Value 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 0.80%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Administration fees rr_Component2OtherExpensesOverAssets 0.06%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.45%
Total other expenses rr_OtherExpensesOverAssets 0.76%
Total annual fund operating expenses rr_ExpensesOverAssets 2.31%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 2.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 334
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 721
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,646
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 234
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 721
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,235
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,646
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.99%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.44%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.09%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2016
BNY Mellon Small Cap Value 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 0.80%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Administration fees rr_Component2OtherExpensesOverAssets 0.06%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.21%
Total other expenses rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.07%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 340
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 590
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,306
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 109
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 340
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 590
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,306
Annual Return 2011 rr_AnnualReturn2011 (1.92%)
Annual Return 2012 rr_AnnualReturn2012 18.47%
Annual Return 2013 rr_AnnualReturn2013 36.18%
Annual Return 2014 rr_AnnualReturn2014 2.27%
Annual Return 2015 rr_AnnualReturn2015 (6.05%)
Annual Return 2016 rr_AnnualReturn2016 25.85%
Annual Return 2017 rr_AnnualReturn2017 10.53%
Annual Return 2018 rr_AnnualReturn2018 (8.37%)
Annual Return 2019 rr_AnnualReturn2019 24.51%
Annual Return 2020 rr_AnnualReturn2020 4.22%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.22%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.59%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.66%
BNY Mellon Small Cap Value Fund | Class I | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.02%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.99%
BNY Mellon Small Cap Value Fund | Class I | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.63%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.96%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.18%
BNY Mellon Small Cap Value 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 0.80%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Administration fees rr_Component2OtherExpensesOverAssets 0.06%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.15%
Total other expenses rr_OtherExpensesOverAssets 0.21%
Total annual fund operating expenses rr_ExpensesOverAssets 1.01%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 321
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 557
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,235
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 321
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 557
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,235
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.33%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.63%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.68%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2016
[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, until February 1, 2022, to waive receipt of its fees and/or assume the direct expenses of Class Y shares so that the annual fund operating expenses for Class Y shares (excluding taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed 1.00%. On or after February 1, 2022, BNY Mellon Investment Adviser, Inc. may terminate this expense limitation agreement at any time.