<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.1.1.u2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>669</ContextCount>
  <ElementCount>62</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>64</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>010000 - Disclosure - Form N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/N1aCover</Role>
      <ShortName>Form N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010001 - Disclosure - Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturn</Role>
      <ShortName>Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010002 - Disclosure - Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/FeesAndExpenses</Role>
      <ShortName>Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>010003 - Disclosure - Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentStrategy</Role>
      <ShortName>Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>010004 - Disclosure - Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentRisks</Role>
      <ShortName>Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>010005 - Disclosure - Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceManagement</Role>
      <ShortName>Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>020020 - Disclosure - Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/OperatingExpensesData</Role>
      <ShortName>Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>020030 - Disclosure - Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ExpenseExample</Role>
      <ShortName>Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>020040 - Disclosure - Expense Example, No Redemption</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption</Role>
      <ShortName>Expense Example, No Redemption</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>020050 - Disclosure - Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/BarChartData</Role>
      <ShortName>Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>020060 - Disclosure - Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceTableData</Role>
      <ShortName>Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>020100 - Document - Risk/Return Summary {Unlabeled} - Administrative Shares Prospectus - DREYFUS CASH MANAGEMENT (administrative shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledAdministrativeSharesProspectusDREYFUSCASHMANAGEMENTadministrativeshares</Role>
      <ShortName>Risk/Return Summary- Administrative Shares Prospectus - DREYFUS CASH MANAGEMENT (administrative shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>020101 - Disclosure - Risk/Return Detail Data {Elements} - Administrative Shares Prospectus - DREYFUS CASH MANAGEMENT (administrative shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsAdministrativeSharesProspectusDREYFUSCASHMANAGEMENTadministrativeshares</Role>
      <ShortName>Risk/Return Detail Data- Administrative Shares Prospectus - DREYFUS CASH MANAGEMENT (administrative shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>020102 - Document - Risk/Return Summary {Unlabeled} - Administrative Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledAdministrativeSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmanagementAdministrativeShares</Role>
      <ShortName>Risk/Return Summary- Administrative Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>020103 - Disclosure - Risk/Return Detail Data {Elements} - Administrative Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsAdministrativeSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmanagementAdministrativeShares</Role>
      <ShortName>Risk/Return Detail Data- Administrative Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>020104 - Document - Risk/Return Summary {Unlabeled} - Administrative Shares Prospectus - Dreyfus Government Securities Cash Management (- Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledAdministrativeSharesProspectusDreyfusGovernmentSecuritiesCashManagementAdministrativeShares</Role>
      <ShortName>Risk/Return Summary- Administrative Shares Prospectus - Dreyfus Government Securities Cash Management (- Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>020105 - Disclosure - Risk/Return Detail Data {Elements} - Administrative Shares Prospectus - Dreyfus Government Securities Cash Management (- Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsAdministrativeSharesProspectusDreyfusGovernmentSecuritiesCashManagementAdministrativeShares</Role>
      <ShortName>Risk/Return Detail Data- Administrative Shares Prospectus - Dreyfus Government Securities Cash Management (- Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>020106 - Document - Risk/Return Summary {Unlabeled} - Administrative Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledAdministrativeSharesProspectusDreyfusTreasuryObligationsCashManagementAdministrativeShares</Role>
      <ShortName>Risk/Return Summary- Administrative Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>020107 - Disclosure - Risk/Return Detail Data {Elements} - Administrative Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsAdministrativeSharesProspectusDreyfusTreasuryObligationsCashManagementAdministrativeShares</Role>
      <ShortName>Risk/Return Detail Data- Administrative Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>020108 - Document - Risk/Return Summary {Unlabeled} - Administrative Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledAdministrativeSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTAdministrativeShares</Role>
      <ShortName>Risk/Return Summary- Administrative Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020109 - Disclosure - Risk/Return Detail Data {Elements} - Administrative Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Administrative Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsAdministrativeSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTAdministrativeShares</Role>
      <ShortName>Risk/Return Detail Data- Administrative Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Administrative Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>020110 - Document - Risk/Return Summary {Unlabeled} - BOLD Shares Prospectus - Dreyfus Government Cash Management (- BOLD Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledBOLDSharesProspectusDreyfusGovernmentCashManagementBOLDShares</Role>
      <ShortName>Risk/Return Summary- BOLD Shares Prospectus - Dreyfus Government Cash Management (- BOLD Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>020111 - Disclosure - Risk/Return Detail Data {Elements} - BOLD Shares Prospectus - Dreyfus Government Cash Management (- BOLD Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsBOLDSharesProspectusDreyfusGovernmentCashManagementBOLDShares</Role>
      <ShortName>Risk/Return Detail Data- BOLD Shares Prospectus - Dreyfus Government Cash Management (- BOLD Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>020112 - Document - Risk/Return Summary {Unlabeled} - Institutional Shares Prospectus - DREYFUS CASH MANAGEMENT (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInstitutionalSharesProspectusDREYFUSCASHMANAGEMENTInstitutionalShares</Role>
      <ShortName>Risk/Return Summary- Institutional Shares Prospectus - DREYFUS CASH MANAGEMENT (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>020113 - Disclosure - Risk/Return Detail Data {Elements} - Institutional Shares Prospectus - DREYFUS CASH MANAGEMENT (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInstitutionalSharesProspectusDREYFUSCASHMANAGEMENTInstitutionalShares</Role>
      <ShortName>Risk/Return Detail Data- Institutional Shares Prospectus - DREYFUS CASH MANAGEMENT (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>020114 - Document - Risk/Return Summary {Unlabeled} - Institutional Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash mangement - Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInstitutionalSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmangementInstitutionalShares</Role>
      <ShortName>Risk/Return Summary- Institutional Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash mangement - Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>020115 - Disclosure - Risk/Return Detail Data {Elements} - Institutional Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash mangement - Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInstitutionalSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmangementInstitutionalShares</Role>
      <ShortName>Risk/Return Detail Data- Institutional Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash mangement - Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>020116 - Document - Risk/Return Summary {Unlabeled} - Insitutional Shares Prospectus - Dreyfus Government Securities Cash Management (- Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInsitutionalSharesProspectusDreyfusGovernmentSecuritiesCashManagementInstitutionalShares</Role>
      <ShortName>Risk/Return Summary- Insitutional Shares Prospectus - Dreyfus Government Securities Cash Management (- Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>020117 - Disclosure - Risk/Return Detail Data {Elements} - Insitutional Shares Prospectus - Dreyfus Government Securities Cash Management (- Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInsitutionalSharesProspectusDreyfusGovernmentSecuritiesCashManagementInstitutionalShares</Role>
      <ShortName>Risk/Return Detail Data- Insitutional Shares Prospectus - Dreyfus Government Securities Cash Management (- Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>020118 - Document - Risk/Return Summary {Unlabeled} - Insitutional Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInsitutionalSharesProspectusDreyfusTreasuryObligationsCashManagementInstitutionalShares</Role>
      <ShortName>Risk/Return Summary- Insitutional Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>020119 - Disclosure - Risk/Return Detail Data {Elements} - Insitutional Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInsitutionalSharesProspectusDreyfusTreasuryObligationsCashManagementInstitutionalShares</Role>
      <ShortName>Risk/Return Detail Data- Insitutional Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>020120 - Document - Risk/Return Summary {Unlabeled} - Insitutional Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInsitutionalSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTInstitutionalShares</Role>
      <ShortName>Risk/Return Summary- Insitutional Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>020121 - Disclosure - Risk/Return Detail Data {Elements} - Insitutional Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Institutional Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInsitutionalSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTInstitutionalShares</Role>
      <ShortName>Risk/Return Detail Data- Insitutional Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Institutional Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>020122 - Document - Risk/Return Summary {Unlabeled} - Insitutional Shares Prospectus - DREYFUS TAX EXEMPT CASH MANAGEMENT FUND</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInsitutionalSharesProspectusDREYFUSTAXEXEMPTCASHMANAGEMENTFUND</Role>
      <ShortName>Risk/Return Summary- Insitutional Shares Prospectus - DREYFUS TAX EXEMPT CASH MANAGEMENT FUND</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>020123 - Disclosure - Risk/Return Detail Data {Elements} - Insitutional Shares Prospectus - DREYFUS TAX EXEMPT CASH MANAGEMENT FUND</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInsitutionalSharesProspectusDREYFUSTAXEXEMPTCASHMANAGEMENTFUND</Role>
      <ShortName>Risk/Return Detail Data- Insitutional Shares Prospectus - DREYFUS TAX EXEMPT CASH MANAGEMENT FUND</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>020124 - Document - Risk/Return Summary {Unlabeled} - Investor Shares Prospectus - DREYFUS CASH MANAGEMENT (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInvestorSharesProspectusDREYFUSCASHMANAGEMENTInvestorShares</Role>
      <ShortName>Risk/Return Summary- Investor Shares Prospectus - DREYFUS CASH MANAGEMENT (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>020125 - Disclosure - Risk/Return Detail Data {Elements} - Investor Shares Prospectus - DREYFUS CASH MANAGEMENT (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInvestorSharesProspectusDREYFUSCASHMANAGEMENTInvestorShares</Role>
      <ShortName>Risk/Return Detail Data- Investor Shares Prospectus - DREYFUS CASH MANAGEMENT (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>020126 - Document - Risk/Return Summary {Unlabeled} - Investor Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInvestorSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmanagementInvestorShares</Role>
      <ShortName>Risk/Return Summary- Investor Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>020127 - Disclosure - Risk/Return Detail Data {Elements} - Investor Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInvestorSharesProspectusDreyfusGovernmentCashManagementdreyfusgovernmentcashmanagementInvestorShares</Role>
      <ShortName>Risk/Return Detail Data- Investor Shares Prospectus - Dreyfus Government Cash Management (dreyfus government cash management - Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>020128 - Document - Risk/Return Summary {Unlabeled} - Investor Shares Prospectus - Dreyfus Government Securities Cash Management (- Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInvestorSharesProspectusDreyfusGovernmentSecuritiesCashManagementInvestorShares</Role>
      <ShortName>Risk/Return Summary- Investor Shares Prospectus - Dreyfus Government Securities Cash Management (- Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>020129 - Disclosure - Risk/Return Detail Data {Elements} - Investor Shares Prospectus - Dreyfus Government Securities Cash Management (- Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInvestorSharesProspectusDreyfusGovernmentSecuritiesCashManagementInvestorShares</Role>
      <ShortName>Risk/Return Detail Data- Investor Shares Prospectus - Dreyfus Government Securities Cash Management (- Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>020130 - Document - Risk/Return Summary {Unlabeled} - Investor Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInvestorSharesProspectusDreyfusTreasuryObligationsCashManagementInvestorShares</Role>
      <ShortName>Risk/Return Summary- Investor Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>020131 - Disclosure - Risk/Return Detail Data {Elements} - Investor Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInvestorSharesProspectusDreyfusTreasuryObligationsCashManagementInvestorShares</Role>
      <ShortName>Risk/Return Detail Data- Investor Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>020132 - Document - Risk/Return Summary {Unlabeled} - Investor Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledInvestorSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTInvestorShares</Role>
      <ShortName>Risk/Return Summary- Investor Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>020133 - Disclosure - Risk/Return Detail Data {Elements} - Investor Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Investor Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsInvestorSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTInvestorShares</Role>
      <ShortName>Risk/Return Detail Data- Investor Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Investor Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>020134 - Document - Risk/Return Summary {Unlabeled} - Participant Shares Prospectus - Dreyfus Government Cash Management (- Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledParticipantSharesProspectusDreyfusGovernmentCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Summary- Participant Shares Prospectus - Dreyfus Government Cash Management (- Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>020135 - Disclosure - Risk/Return Detail Data {Elements} - Participant Shares Prospectus - Dreyfus Government Cash Management (- Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsParticipantSharesProspectusDreyfusGovernmentCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Detail Data- Participant Shares Prospectus - Dreyfus Government Cash Management (- Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>020136 - Document - Risk/Return Summary {Unlabeled} - Participant Shares Prospectus - Dreyfus Government Securities Cash Management (- Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledParticipantSharesProspectusDreyfusGovernmentSecuritiesCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Summary- Participant Shares Prospectus - Dreyfus Government Securities Cash Management (- Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>020137 - Disclosure - Risk/Return Detail Data {Elements} - Participant Shares Prospectus - Dreyfus Government Securities Cash Management (- Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsParticipantSharesProspectusDreyfusGovernmentSecuritiesCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Detail Data- Participant Shares Prospectus - Dreyfus Government Securities Cash Management (- Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>020138 - Document - Risk/Return Summary {Unlabeled} - Participant Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledParticipantSharesProspectusDreyfusTreasuryObligationsCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Summary- Participant Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>020139 - Disclosure - Risk/Return Detail Data {Elements} - Participant Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsParticipantSharesProspectusDreyfusTreasuryObligationsCashManagementParticipantShares</Role>
      <ShortName>Risk/Return Detail Data- Participant Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>020140 - Document - Risk/Return Summary {Unlabeled} - Participant Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledParticipantSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTParticipantShares</Role>
      <ShortName>Risk/Return Summary- Participant Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>020141 - Disclosure - Risk/Return Detail Data {Elements} - Participant Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Participant Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsParticipantSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTParticipantShares</Role>
      <ShortName>Risk/Return Detail Data- Participant Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Participant Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>020142 - Document - Risk/Return Summary {Unlabeled} - Service Shares Prospectus - Dreyfus Government Cash Management (- Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledServiceSharesProspectusDreyfusGovernmentCashManagementServiceShares</Role>
      <ShortName>Risk/Return Summary- Service Shares Prospectus - Dreyfus Government Cash Management (- Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>020143 - Disclosure - Risk/Return Detail Data {Elements} - Service Shares Prospectus - Dreyfus Government Cash Management (- Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsServiceSharesProspectusDreyfusGovernmentCashManagementServiceShares</Role>
      <ShortName>Risk/Return Detail Data- Service Shares Prospectus - Dreyfus Government Cash Management (- Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>020144 - Document - Risk/Return Summary {Unlabeled} - Service Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledServiceSharesProspectusDreyfusTreasuryObligationsCashManagementServiceShares</Role>
      <ShortName>Risk/Return Summary- Service Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>020145 - Disclosure - Risk/Return Detail Data {Elements} - Service Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsServiceSharesProspectusDreyfusTreasuryObligationsCashManagementServiceShares</Role>
      <ShortName>Risk/Return Detail Data- Service Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>020146 - Document - Risk/Return Summary {Unlabeled} - Service Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledServiceSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTServiceShares</Role>
      <ShortName>Risk/Return Summary- Service Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>020147 - Disclosure - Risk/Return Detail Data {Elements} - Service Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Service Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsServiceSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTServiceShares</Role>
      <ShortName>Risk/Return Detail Data- Service Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Service Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>020148 - Document - Risk/Return Summary {Unlabeled} - Spark Shares Prospectus - Dreyfus Government Cash Management (-SPARK Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledSparkSharesProspectusDreyfusGovernmentCashManagementSPARKShares</Role>
      <ShortName>Risk/Return Summary- Spark Shares Prospectus - Dreyfus Government Cash Management (-SPARK Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>020149 - Disclosure - Risk/Return Detail Data {Elements} - Spark Shares Prospectus - Dreyfus Government Cash Management (-SPARK Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsSparkSharesProspectusDreyfusGovernmentCashManagementSPARKShares</Role>
      <ShortName>Risk/Return Detail Data- Spark Shares Prospectus - Dreyfus Government Cash Management (-SPARK Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>020150 - Document - Risk/Return Summary {Unlabeled} - Wealth Shares Prospectus - Dreyfus Government Cash Management (- Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledWealthSharesProspectusDreyfusGovernmentCashManagementWealthShares</Role>
      <ShortName>Risk/Return Summary- Wealth Shares Prospectus - Dreyfus Government Cash Management (- Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>020151 - Disclosure - Risk/Return Detail Data {Elements} - Wealth Shares Prospectus - Dreyfus Government Cash Management (- Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsWealthSharesProspectusDreyfusGovernmentCashManagementWealthShares</Role>
      <ShortName>Risk/Return Detail Data- Wealth Shares Prospectus - Dreyfus Government Cash Management (- Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>020152 - Document - Risk/Return Summary {Unlabeled} - Wealth Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledWealthSharesProspectusDreyfusTreasuryObligationsCashManagementWealthShares</Role>
      <ShortName>Risk/Return Summary- Wealth Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>020153 - Disclosure - Risk/Return Detail Data {Elements} - Wealth Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsWealthSharesProspectusDreyfusTreasuryObligationsCashManagementWealthShares</Role>
      <ShortName>Risk/Return Detail Data- Wealth Shares Prospectus - Dreyfus Treasury Obligations Cash Management (Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>020154 - Document - Risk/Return Summary {Unlabeled} - Wealth Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DocumentRiskReturnSummaryUnlabeledWealthSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTWealthShares</Role>
      <ShortName>Risk/Return Summary- Wealth Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ck0000740766-20240131.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>020155 - Disclosure - Risk/Return Detail Data {Elements} - Wealth Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Wealth Shares)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.dreyfus.com/20240131/role/DisclosureRiskReturnDetailDataElementsWealthSharesProspectusDREYFUSTREASURYSECURITIESCASHMANAGEMENTWealthShares</Role>
      <ShortName>Risk/Return Detail Data- Wealth Shares Prospectus - DREYFUS TREASURY SECURITIES CASH MANAGEMENT (Wealth Shares)</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="485BPOS" isN1a="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="ck0000740766-20240131.htm">ck0000740766-20240131.htm</File>
    <File>ck0000740766-20240131.xsd</File>
    <File>ck0000740766-20240131_def.xml</File>
    <File>ck0000740766-20240131_lab.xml</File>
    <File>ck0000740766-20240131_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>img_174da5fc377d4f2.jpg</File>
    <File>img_17862e1f8a224f9.jpg</File>
    <File>img_1abb3f84a82d4f3.jpg</File>
    <File>img_20966cc7e5f74f6.jpg</File>
    <File>img_27aa5b3b238b4f4.jpg</File>
    <File>img_2c6228e463334f4.jpg</File>
    <File>img_2c8d66ec5c664f2.jpg</File>
    <File>img_3547ca5602e04f6.jpg</File>
    <File>img_376bd5fa815e4f4.jpg</File>
    <File>img_377c7bea30564f4.jpg</File>
    <File>img_3b22ea354b824f5.jpg</File>
    <File>img_4b351a7040844f7.jpg</File>
    <File>img_4fc89f56409f4f5.jpg</File>
    <File>img_542b97a8f41c4f4.jpg</File>
    <File>img_58a5e82f3da64f2.jpg</File>
    <File>img_5c684c98fef94f5.jpg</File>
    <File>img_5e256695203f4f3.jpg</File>
    <File>img_5e9c90c769404f7.jpg</File>
    <File>img_63177bcf8b874f4.jpg</File>
    <File>img_6485387ef49f4f2.jpg</File>
    <File>img_67554444c9e04f5.jpg</File>
    <File>img_6c3a2ebdc3dd4f2.jpg</File>
    <File>img_72ee918f08b24f4.jpg</File>
    <File>img_7ba1f16d79294f5.jpg</File>
    <File>img_7c978b7ed2be4f4.jpg</File>
    <File>img_7e8203ba1f3d4f6.jpg</File>
    <File>img_81ef16dde9854f8.jpg</File>
    <File>img_85e88a84c8654f2.jpg</File>
    <File>img_8b4694bc72144f9.jpg</File>
    <File>img_8dbd507ca2dc4f6.jpg</File>
    <File>img_8e0b969e2e624f2.jpg</File>
    <File>img_9124c22d3e2b4f8.jpg</File>
    <File>img_97ce3fb954114f5.jpg</File>
    <File>img_9cc44270d3504f8.jpg</File>
    <File>img_9ed26d695f134f7.jpg</File>
    <File>img_a01e8591c9a34f2.jpg</File>
    <File>img_a18069a3193b4f5.jpg</File>
    <File>img_a6bd9b218f754f6.jpg</File>
    <File>img_b79350da0d684f3.jpg</File>
    <File>img_c3e37a1a0b594f6.jpg</File>
    <File>img_c52cade186754f3.jpg</File>
    <File>img_cdf543819c8f4f7.jpg</File>
    <File>img_ce17fffc31454f5.jpg</File>
    <File>img_d666ce6facc94f7.jpg</File>
    <File>img_da88846e8dc04f7.jpg</File>
    <File>img_de3abf6745d74f9.jpg</File>
    <File>img_e283b0aafeaf4f9.jpg</File>
    <File>img_e5cad105e7c14f9.jpg</File>
    <File>img_efcaa7f0b0e34f4.jpg</File>
    <File>img_f5ad601adba14f8.jpg</File>
    <File>img_fe8462c26eba4f6.jpg</File>
    <File>img_ffbde0923e694f9.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="2018">http://xbrl.sec.gov/oef/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
