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Label Element Value
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market 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 as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity.
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.
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)
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 Example is based on net operating expenses, which reflect the contractual undertaking 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

The fund pursues its investment objective by investing only in government securities (i.e., securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, including those with floating or variable rates of interest), repurchase agreements collateralized solely by government securities and/or cash, and cash. The fund is a money market fund subject to the maturity, quality, liquidity and diversification requirements of Rule 2a-7 under the Investment Company Act of 1940, as amended, and seeks to maintain a stable share price of $1.00.

The fund is a "government money market fund," as that term is defined in Rule 2a-7, and as such is required to invest at least 99.5% of its total assets in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, repurchase agreements collateralized solely by cash and/or government securities, and cash. Under normal conditions, the fund will invest its assets so that at least 80% of its net assets (plus any borrowing

for investment purposes) are invested in government securities and/or repurchase agreements that are collateralized fully by government securities. The securities in which the fund invests include those backed by the full faith and credit of the U.S. government, which include U.S. Treasury securities as well as securities issued by certain agencies of the U.S. government, and those that are neither insured nor guaranteed by the U.S. government.

The fund invests in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities and seeks to enter into repurchase agreements that present minimal credit risk, based on an assessment by Dreyfus, a division of Mellon Investments Corporation, the fund's sub-adviser, of the issuer's, guarantor's or counterparty's credit quality and capacity to meet its financial obligations, among other factors.

Shares of the fund are intended to qualify as eligible investments for federally chartered credit unions. The fund intends to review changes in the applicable laws, rules and regulations governing eligible investments for federally chartered credit unions, and to take such action as may be necessary to ensure that shares of the fund qualify as eligible investments under the Federal Credit Union Act and the regulations thereunder. Shares of the fund, however, may or may not qualify as eligible investments for particular state-chartered credit unions. A state-chartered credit union should consult its legal counsel to determine whether the fund is a permissible investment under the laws applicable to it.
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 Institutional shares from year to year. The table shows the average annual total returns of the fund's Institutional shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.
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.dreyfus.com
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture The fund's past performance 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: 1.34
Worst Quarter
2021, Q4: 0.00

The year-to-date total return of the fund's Institutional shares as of June 30, 2025 was 2.14%.
Performance Table Closing [Text Block] oef_PerformanceTableClosingTextBlock

Institutions may call toll-free 1-800-373-9387 (inside the U.S. only) for the current yield of the fund's Institutional shares. Individuals or entities for whom institutions may purchase or redeem shares should call the institution directly.
Average Annual Return, Caption [Optional Text] oef_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/24)
Money Market Seven Day Yield Phone oef_MoneyMarketSevenDayYieldPhone 1-800-373-9387
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock
Principal Risks

An investment in the fund is not a bank account or a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund's yield will fluctuate as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in securities with different interest rates. BNY Mellon Investment Adviser, Inc. and its affiliates are not required to reimburse the fund for losses, and you should not expect that BNY Mellon Investment Adviser, Inc. or its affiliates will provide financial support to the fund at any time, including during periods of market stress. The following are the principal risks that could reduce the fund's income level and/or share price:
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock You could lose money by investing in the fund.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Risk Money Market Fund Price Fluctuates [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock The fund's yield will fluctuate as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in securities with different interest rates.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Risk Money Market Fund May Not Preserve Dollar [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Risk Not Insured [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock An investment in the fund is not a bank account or a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | · Interest rate risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Interest rate risk: This risk refers to the decline in the prices of fixed-income securities that may accompany a rise in the overall level of interest rates. A sharp and unexpected rise in interest rates could impair the fund's ability to maintain a stable net asset value. 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. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance. For floating and variable rate obligations, there may be a lag between an actual change in the underlying interest rate benchmark and the reset time for an interest payment of such an obligation, which could harm or benefit the fund, depending on the interest rate environment or other circumstances.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market 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 may fall dramatically, potentially impairing the fund's ability to maintain a stable net asset value.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | · U.S. Treasury securities risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· U.S. Treasury securities risk: A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of interest and principal when held to maturity, but the market prices for such securities are not guaranteed and will fluctuate.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | · Government securities risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Government securities risk: Not all obligations of the U.S. government, its agencies and instrumentalities are backed by the full faith and credit of the U.S. Treasury. Some obligations are backed only by the credit of the issuing agency or instrumentality, and in some cases there may be some risk of default by the issuer. Any guarantee by the U.S. government or its agencies or instrumentalities of a security held by the fund does not apply to the market value of such security or to shares of the fund itself.

Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | · Repurchase agreement counterparty risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

· Repurchase agreement counterparty risk: The fund is subject to the risk that a counterparty in a repurchase agreement could fail to honor the terms of the agreement.
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market 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.  Events such as war, acts of terrorism, the spread of infectious illness or other public health issue, recessions, or other events could have a significant impact on the fund and its investments. 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.

 
Prospectus Summary | Dreyfus Institutional Preferred Government Money Market Fund | Institutional Shares  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol DSVXX
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.00% [1]
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.10%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.00%) [1],[2]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.10%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 10
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 32
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 57
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 129
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel The year-to-date total return of the fund's Institutional shares as of
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Jun. 30, 2025
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 2.14%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 1.34%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Dec. 31, 2021
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn none
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.24%
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.45%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.74%
Annual Return [Percent] oef_AnnlRtrPct 0.07%
Annual Return [Percent] oef_AnnlRtrPct 0.29%
Annual Return [Percent] oef_AnnlRtrPct 0.83%
Annual Return [Percent] oef_AnnlRtrPct 1.79%
Annual Return [Percent] oef_AnnlRtrPct 2.15%
Annual Return [Percent] oef_AnnlRtrPct 0.40%
Annual Return [Percent] oef_AnnlRtrPct 0.01%
Annual Return [Percent] oef_AnnlRtrPct 1.63%
Annual Return [Percent] oef_AnnlRtrPct 5.11%
Annual Return [Percent] oef_AnnlRtrPct 5.24%
[1] Amount represents less than .01%.
[2] The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has agreed in its management agreement with the fund to pay all of the fund's expenses, except management fees, brokerage fees and commissions, if any, fees pursuant to any administration agreement or distribution or service plan adopted by the fund, fees and expenses of the non-interested board members and their counsel and independent counsel to the fund, and any extraordinary expenses. BNY Mellon Investment Adviser, Inc. has further agreed to reduce its fee in an amount equal to the fund's allocable portion of the fees and expenses of the non-interested board members and the fees and expenses of independent counsel to the fund and to the non-interested board members (in the amount of less than .01% for the past fiscal year). These provisions in the management agreement may not be amended without the approval of the fund's shareholders.