v3.25.2
Label Element Value
BNY Mellon Short Term Municipal Bond 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 to maximize current income exempt from federal income tax to the extent consistent with the preservation 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 $100,000 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 41.53% of the average value of its portfolio.
Portfolio Turnover, Rate oef_PortfolioTurnoverRate 41.53%
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 $100,000 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 $ 100,000
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 and then hold or 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-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:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

To pursue its goal, the fund normally invests substantially all (at least 80%) of its net assets, plus any borrowings for investment purposes, in municipal bonds that provide income exempt from federal personal income tax. Municipal bonds are debt securities or other obligations issued by states, territories and possessions of the United States and the District of Columbia and their political subdivisions, agencies and instrumentalities, or multistate agencies and authorities.

The fund invests at least 80% of its net assets in municipal bonds rated, at the time of purchase, investment grade (Baa/BBB or higher) or the unrated equivalent as determined by Insight North America LLC, the fund's sub-adviser. For additional yield, the fund may invest up to 20% of its net assets in municipal bonds rated, at the time of purchase, below investment grade ("high yield" or "junk" bonds) to as low as Caa/CCC or the unrated equivalent as determined by the fund's sub-adviser. The fund invests principally in municipal bonds with remaining maturities or mandatory puts of five years or less and generally maintains a dollar-weighted average portfolio maturity of one to three years. A bond's maturity is the length of time until the principal must be fully repaid with interest. Dollar-weighted average maturity is an average of the stated maturities of the bonds held by the fund, based on their dollar-weighted proportions in the fund.

The fund's sub-adviser focuses on identifying undervalued sectors and securities. To select municipal bonds for the fund, the sub-adviser uses fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and actively trades among various sectors and securities based on their apparent relative values. The fund seeks to invest in several different sectors, and does not seek to overweight any particular sector but may do so depending on each sector's relative value at a given time. A rigorous sell discipline is employed to continuously evaluate all fund holdings. Current holdings may become sell candidates if creditworthiness is deteriorating, if bonds with better risk and return characteristics become available, or if the holding no longer meets the sub-adviser's strategic or portfolio construction objectives.

Although the fund seeks to provide income exempt from federal income tax, income from some of the fund's holdings may be subject to the federal alternative minimum tax.
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 D shares from year to year. The table compares the average annual total returns of the fund's shares to those of the Bloomberg U.S. Municipal Bond Index, a broad measure of market performance, and the Bloomberg Municipal Bond 1-3 Year Blend Index. 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 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 Closing [Text Block] oef_BarChartClosingTextBlock

During the periods shown in the chart:
Best Quarter
2023, Q4: 2.86
Worst Quarter
2022, Q1: (3.45)

The year-to-date total return of the fund's Class D shares as of June 30, 2025 was 1.83%.
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 D 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 the period.
Performance Table Narrative oef_PerformanceTableNarrativeTextBlock

After-tax performance is shown only for Class D 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 the period.
Average Annual Return, Caption [Optional Text] oef_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/24)
BNY Mellon Short Term Municipal Bond 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 Short Term Municipal Bond 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 Short Term Municipal Bond 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 Short Term Municipal Bond Fund | · Municipal securities risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Municipal securities risk: The amount of public information available about municipal securities is generally less than that for corporate equities or bonds. Special factors, such as legislative changes, and state and local economic and business developments, may adversely affect the yield and/or value of the fund's investments in municipal securities. Other factors include the general conditions of the municipal securities market, the size of the particular offering, the maturity of the obligation and the rating of the issue. Changes in economic, business or political conditions relating to a particular municipal project, municipality, or state, territory or possession of the United States in which the fund invests may have an impact on the fund's share price. Any credit impairment could adversely impact the value of their bonds, which could negatively impact the performance of the fund.

BNY Mellon Short Term Municipal Bond Fund | · Interest rate risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Interest rate risk: Prices of bonds and other fixed rate fixed-income securities tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect fixed-income securities and, accordingly, will cause the value of the fund's investments in these securities to decline. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation and changes in general economic conditions. It is

difficult to predict the pace at which central banks or monetary authorities may increase (or decrease) interest rates or the timing, frequency, or magnitude of such changes. During periods of very low interest rates, which occur from time to time due to market forces or actions of governments and/or their central banks, including the Board of Governors of the Federal Reserve System in the U.S., the fund may be subject to a greater risk of principal decline from rising interest rates. When interest rates fall, the fund's investments in new securities may be at lower yields and may reduce the fund's income. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance. The magnitude of these fluctuations in the market price of fixed-income securities is generally greater for securities with longer effective maturities and durations because such instruments do not mature, reset interest rates or become callable for longer periods of time. Unlike investment grade bonds, however, the prices of high yield ("junk") bonds may fluctuate unpredictably and not necessarily inversely with changes in interest rates.

BNY Mellon Short Term Municipal Bond Fund | · Credit risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Credit risk: Failure of an issuer of a security to make timely interest or principal payments when due, or a decline or perception of a decline in the credit quality of the security, can cause the security's price to fall. The lower a security's credit rating, the greater the chance that the issuer of the security will default or fail to meet its payment obligations.
BNY Mellon Short Term Municipal Bond Fund | · High yield securities risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· High yield securities risk: High yield ("junk") securities involve greater credit risk, including the risk of default, than investment grade securities, and are considered predominantly speculative with respect to the issuer's ability to make principal and interest payments. These securities are especially sensitive to adverse changes in general economic conditions, to changes in the financial condition of their issuers and to price fluctuation in response to changes in interest rates. During periods of economic downturn or rising interest rates, issuers of below investment grade securities may experience financial stress that could adversely affect their ability to make payments of principal and interest and increase the possibility of default.
BNY Mellon Short Term Municipal Bond 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. The secondary market for certain municipal bonds tends to be less well developed or liquid than many other securities markets, which may adversely affect the fund's ability to sell such municipal bonds at attractive prices. 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 or sell at an acceptable price, especially during times of market volatility or decline.

BNY Mellon Short Term Municipal Bond 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, or other events could have a significant impact on the fund and its investments. 

BNY Mellon Short Term Municipal Bond 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 Short Term Municipal Bond Fund | Bloomberg U.S. Municipal Bond Index reflects no deductions for fees, expenses or taxes  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Bloomberg U.S. Municipal Bond Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.05%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.99%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.25%
BNY Mellon Short Term Municipal Bond Fund | Bloomberg Municipal Bond 1 to 3 Year Blend Index reflects no deductions for fees, expenses or taxes  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Bloomberg Municipal Bond 1 to 3 Year Blend Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.29%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.17%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.33%
BNY Mellon Short Term Municipal Bond Fund | A  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DMBAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00% [1]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.25%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.25%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.24%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.49%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.74%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.10%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.64%
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2026
Expenses Deferred Charges [Text Block] oef_ExpensesDeferredChargesTextBlock Class A shares bought without an initial sales charge as part of an investment of $250,000 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 $ 314
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 471
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 642
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,136
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct (0.41%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.08%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.54%
BNY Mellon Short Term Municipal Bond Fund | D  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DSIBX
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 0.25%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.10%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.22%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.22%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.57%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.08%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.49%
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 50
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 175
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 310
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 706
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel The year-to-date total return of the fund's Class D shares as of
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Jun. 30, 2025
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 1.83%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 2.86%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (3.45%)
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.34%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.74%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.95%
Annual Return [Percent] oef_AnnlRtrPct 0.86%
Annual Return [Percent] oef_AnnlRtrPct (0.49%)
Annual Return [Percent] oef_AnnlRtrPct 1.21%
Annual Return [Percent] oef_AnnlRtrPct 1.22%
Annual Return [Percent] oef_AnnlRtrPct 3.03%
Annual Return [Percent] oef_AnnlRtrPct 2.39%
Annual Return [Percent] oef_AnnlRtrPct (0.19%)
Annual Return [Percent] oef_AnnlRtrPct (3.69%)
Annual Return [Percent] oef_AnnlRtrPct 3.00%
Annual Return [Percent] oef_AnnlRtrPct 2.34%
BNY Mellon Short Term Municipal Bond Fund | D | 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 2.34%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.74%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.94%
BNY Mellon Short Term Municipal Bond Fund | D | 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 2.11%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.83%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.98%
BNY Mellon Short Term Municipal Bond Fund | I  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DIMIX
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 0.25%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.23%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.23%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.48%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.39%
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 145
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 260
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 595
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.44%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.82%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.04%
BNY Mellon Short Term Municipal Bond Fund | Y  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DMYBX
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 0.25%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Component2 Other Expenses oef_Component2OtherExpensesOverAssets 0.00%
Component3 Other Expenses oef_Component3OtherExpensesOverAssets 0.19%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.19%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.44%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.39%
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2026
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 136
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 550
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel returns before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.58%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.84%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.02%
[1] Class A shares bought without an initial sales charge as part of an investment of $250,000 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 August 1, 2026, to waive receipt of its fees and/or assume the direct expenses of the fund so that the direct expenses of none of the fund's share classes (excluding Rule 12b-1 fees, shareholder services fees, taxes, interest expense, brokerage commissions, commitment fees on borrowings and extraordinary expenses) exceed .39%. On or after August 1, 2026, BNY Mellon Investment Adviser, Inc. may terminate this expense limitation agreement at any time.