v3.26.1
Label Element Value
BNY Mellon Small/Mid Cap Growth Fund  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading Fund Summary
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock The fund seeks long-term growth of capital.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_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 table 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 11 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 [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)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_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 131.25% of the average value of its portfolio.
Portfolio Turnover, Rate oef_PortfolioTurnoverRate 131.25%
Expense Breakpoint Discounts [Text] oef_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] oef_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] oef_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 and mid-cap U.S. companies. The fund currently considers small-cap and mid-cap companies to be those companies with total market capitalizations that are equal to or less than the total market capitalization of the largest company included in the Russell Midcap® Index (the Index). As of December 31, 2025, the market capitalization of the largest company in the Index was approximately $101 billion.

The fund's sub-adviser, Newton Investment Management North America, LLC, an affiliate of BNY Mellon Investment Adviser, Inc., employs a growth-oriented investment style in managing the fund's portfolio, which means the sub-adviser seeks to identify those small-cap and mid-cap companies which are experiencing or are expected to experience rapid earnings or revenue growth. The fund's sub-adviser focuses on high quality companies and individual stock selection, instead of trying to predict which industries or sectors will perform best, and selects stocks by:

· Using fundamental research to identify and follow companies considered to have attractive characteristics, such as strong business and competitive positions, solid cash flows and balance sheets, high quality management and high sustainable growth; and

· Investing in a company when the sub-adviser's research indicates that the company will experience accelerating revenues and expanding operating margins, which may lead to rising estimate trends and favorable earnings surprises.

The fund may, from time to time, invest a significant portion (more than 20%) of its assets in securities of companies in certain sectors, such as the industrials and information technology sectors.

The fund's sub-adviser monitors the securities in the fund's portfolio, and will consider selling a security if the company's business momentum deteriorates or valuation becomes excessive. The fund also may sell a security if an event occurs that contradicts the sub-adviser's rationale for purchasing it for the fund, such as deterioration in the company's financial fundamentals. In addition, the fund may sell a security or if better investment opportunities emerge elsewhere.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] oef_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 the Russell 3000® Index, a broad measure of relevant market performance, and the Russell 2500TM Growth Index, an index reflecting the market segments in which the fund invests. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Performance for each share class will vary due to differences in expenses. More recent performance information may be available at www.bny.com/investments.

Performance Information Illustrates Variability of Returns [Text] oef_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the fund.
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress www.bny.com/investments
Performance Past Does Not Indicate Future [Text] oef_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] oef_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%)
Bar Chart Does Not Reflect Sales Loads [Text] oef_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] oef_BarChartClosingTextBlock

During the periods shown in the chart:
Best Quarter
2020, Q2: 45.31
Worst Quarter
2022, Q2: (26.92)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes reflects no deductions for fees, expenses, or taxes
Performance Table Uses Highest Federal Rate oef_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 oef_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] oef_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 oef_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 oef_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 Z shares, periods prior to the inception date reflect the performance of the fund's Class I shares. Such performance figures have not been adjusted to reflect applicable class fees and expenses of Class Z shares; if such

fees and expenses had been reflected, the performance shown for Class Z 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 [Optional Text] oef_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/25)
BNY Mellon Small/Mid Cap Growth Fund | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock
Principal Risks

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.
BNY Mellon Small/Mid Cap Growth Fund | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
BNY Mellon Small/Mid Cap Growth Fund | Risk Not Insured [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock 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.
BNY Mellon Small/Mid Cap Growth Fund | · Risks of stock investing  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· 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.
BNY Mellon Small/Mid Cap Growth Fund | · Small and midsize company risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· 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. These companies may have limited product lines, markets or financial resources, or may depend on a limited management group. Investments may be made in anticipation of future products, services or events whose delay or cancellation could cause the stock price to drop. 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.
BNY Mellon Small/Mid Cap Growth Fund | · Growth stock risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Growth stock risk: Investors often expect growth companies to increase their earnings at a certain rate. If these expectations are not met, investors can punish the stocks inordinately, even if earnings do increase.

BNY Mellon Small/Mid Cap Growth Fund | · Market risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· 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.  Local, regional or global events such as war, military conflicts, acts of terrorism, natural disasters, the spread of infectious illness or other public health issues, recessions, elevated levels of government debt, changes in trade regulation or economic sanctions, internal unrest and discord, or other events could have a significant impact on the fund and its investments. 

BNY Mellon Small/Mid Cap Growth Fund | · Market sector risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Market sector risk: To the extent the fund's investments emphasize particular sectors, its performance will be especially sensitive to developments that significantly affect those sectors. Individual sectors may be more volatile, and may perform differently, than the broader market.

BNY Mellon Small/Mid Cap Growth Fund | · Liquidity risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· 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. The market for below investment grade securities may be less liquid and therefore these securities may be harder to value, buy or sell at an acceptable price, especially during times of market volatility or decline. Liquidity risk also may refer to the risk that the fund will not be able to pay redemption proceeds within the allowable time period stated in this prospectus because of unusual market conditions, including those resulting in a significant amount of the fund's assets becoming illiquid, an unusually high volume of redemption requests, or other reasons.Liquidity risk also may refer to the risk that the fund will not be able to pay redemption proceeds within the allowable time period stated in this prospectus because of unusual market conditions, including those resulting in a significant amount of the fund's assets becoming illiquid, an unusually high volume of redemption requests, or other reasons.
BNY Mellon Small/Mid Cap Growth Fund | · Management risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Management risk: The investment process used by the fund's sub-adviser could fail to achieve the fund's investment goal and cause your fund investment to lose value.

BNY Mellon Small/Mid Cap Growth Fund | Russell 3000® Index reflects no deductions for fees, expenses, or taxes  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 3000® Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.15%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.15%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.29%
BNY Mellon Small/Mid Cap Growth Fund | Russell 2500TM Growth Index reflects no deductions for fees, expenses or taxes  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 2500TM Growth Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.31%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.98%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.55%
BNY Mellon Small/Mid Cap Growth Fund | A  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DBMAX
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% [1]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component1 Other Expenses oef_Component1OtherExpensesOverAssets 0.03%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.25%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.14%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.42%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.02%
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, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 673
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 881
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,106
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,751
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 673
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 881
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,106
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,751
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 4.88%
Average Annual Return, Percent oef_AvgAnnlRtrPct (3.34%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.43%
BNY Mellon Small/Mid Cap Growth Fund | C  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DBMCX
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 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.75%
Component1 Other Expenses oef_Component1OtherExpensesOverAssets 0.03%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.25%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.23%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.86%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 289
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 585
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,006
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,180
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 189
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 585
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,006
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,180
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.74%
Average Annual Return, Percent oef_AvgAnnlRtrPct (2.99%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.20%
BNY Mellon Small/Mid Cap Growth Fund | I  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol SDSCX
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 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component1 Other Expenses oef_Component1OtherExpensesOverAssets 0.03%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.16%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.19%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 978
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 81
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 252
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 439
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 978
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 45.31%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (26.92%)
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.56%
Average Annual Return, Percent oef_AvgAnnlRtrPct (1.96%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.35%
Annual Return [Percent] oef_AnnlRtrPct 10.79%
Annual Return [Percent] oef_AnnlRtrPct 26.52%
Annual Return [Percent] oef_AnnlRtrPct (1.58%)
Annual Return [Percent] oef_AnnlRtrPct 39.15%
Annual Return [Percent] oef_AnnlRtrPct 68.49%
Annual Return [Percent] oef_AnnlRtrPct (4.14%)
Annual Return [Percent] oef_AnnlRtrPct (33.20%)
Annual Return [Percent] oef_AnnlRtrPct 15.55%
Annual Return [Percent] oef_AnnlRtrPct 9.73%
Annual Return [Percent] oef_AnnlRtrPct 11.56%
BNY Mellon Small/Mid Cap Growth Fund | I | After Taxes on Distributions  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns after taxes on distributions
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.67%
Average Annual Return, Percent oef_AvgAnnlRtrPct (4.23%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.34%
BNY Mellon Small/Mid Cap Growth Fund | I | After Taxes on Distributions and Sales  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns after taxes on distributions and sale of fund shares
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.62%
Average Annual Return, Percent oef_AvgAnnlRtrPct (1.63%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.11%
BNY Mellon Small/Mid Cap Growth Fund | Y  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DBMYX
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 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component1 Other Expenses oef_Component1OtherExpensesOverAssets 0.03%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.06%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.09%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 221
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 384
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 859
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 70
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 221
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 384
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 859
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.60%
Average Annual Return, Percent oef_AvgAnnlRtrPct (1.87%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.45%
BNY Mellon Small/Mid Cap Growth Fund | Z  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DBMZX
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 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.15%
Component1 Other Expenses oef_Component1OtherExpensesOverAssets 0.03%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.10%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 90
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 281
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 488
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,084
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 90
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 281
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 488
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,084
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.44%
Average Annual Return, Percent oef_AvgAnnlRtrPct (2.04%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 11.28%
Performance Inception Date oef_PerfInceptionDate Jan. 19, 2018
[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.