<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>293</ContextCount>
  <ElementCount>316</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>83</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Condensed Consolidated Statements of Earnings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofEarnings</Role>
      <ShortName>Condensed Consolidated Statements of Earnings</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Condensed Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Condensed Consolidated Statements of Comprehensive Income (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofComprehensiveIncomeParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Statement - Condensed Consolidated Statements of Stockholders??? Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders??? Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Statement - Condensed Consolidated Statements of Stockholders??? Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CondensedConsolidatedStatementsofStockholdersEquityParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Stockholders??? Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BASISOFPRESENTATION</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/NEWACCOUNTINGPRONOUNCEMENTS</Role>
      <ShortName>NEW ACCOUNTING PRONOUNCEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - REVENUE RECOGNITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/REVENUERECOGNITION</Role>
      <ShortName>REVENUE RECOGNITION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - WEIGHTED-AVERAGE SHARES OUTSTANDING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/WEIGHTEDAVERAGESHARESOUTSTANDING</Role>
      <ShortName>WEIGHTED-AVERAGE SHARES OUTSTANDING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - INTEREST EXPENSE, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERESTEXPENSENET</Role>
      <ShortName>INTEREST EXPENSE, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - ACQUISITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/ACQUISITIONS</Role>
      <ShortName>ACQUISITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - DEFERRED CLIENT CONVERSION AND START-UP COSTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/DEFERREDCLIENTCONVERSIONANDSTARTUPCOSTS</Role>
      <ShortName>DEFERRED CLIENT CONVERSION AND START-UP COSTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - OTHER NON-CURRENT ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTASSETS</Role>
      <ShortName>OTHER NON-CURRENT ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - PAYABLES AND ACCRUED EXPENSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/PAYABLESANDACCRUEDEXPENSES</Role>
      <ShortName>PAYABLES AND ACCRUED EXPENSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BORROWINGS</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - OTHER NON-CURRENT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTLIABILITIES</Role>
      <ShortName>OTHER NON-CURRENT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - CONTRACTUAL COMMITMENTS, CONTINGENCIES AND OFF-BALANCE SHEET ARRANGEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CONTRACTUALCOMMITMENTSCONTINGENCIESANDOFFBALANCESHEETARRANGEMENTS</Role>
      <ShortName>CONTRACTUAL COMMITMENTS, CONTINGENCIES AND OFF-BALANCE SHEET ARRANGEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSBYCOMPONENT</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - INTERIM FINANCIAL DATA BY SEGMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERIMFINANCIALDATABYSEGMENT</Role>
      <ShortName>INTERIM FINANCIAL DATA BY SEGMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - SUBSEQUENT EVENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/SUBSEQUENTEVENT</Role>
      <ShortName>SUBSEQUENT EVENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BASISOFPRESENTATIONPolicies</Role>
      <ShortName>BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - REVENUE RECOGNITION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/REVENUERECOGNITIONTables</Role>
      <ShortName>REVENUE RECOGNITION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/REVENUERECOGNITION</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - WEIGHTED-AVERAGE SHARES OUTSTANDING (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/WEIGHTEDAVERAGESHARESOUTSTANDINGTables</Role>
      <ShortName>WEIGHTED-AVERAGE SHARES OUTSTANDING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/WEIGHTEDAVERAGESHARESOUTSTANDING</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - INTEREST EXPENSE, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERESTEXPENSENETTables</Role>
      <ShortName>INTEREST EXPENSE, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/INTERESTEXPENSENET</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - ACQUISITIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/ACQUISITIONSTables</Role>
      <ShortName>ACQUISITIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/ACQUISITIONS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - DEFERRED CLIENT CONVERSION AND START-UP COSTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/DEFERREDCLIENTCONVERSIONANDSTARTUPCOSTSTables</Role>
      <ShortName>DEFERRED CLIENT CONVERSION AND START-UP COSTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/DEFERREDCLIENTCONVERSIONANDSTARTUPCOSTS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - OTHER NON-CURRENT ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTASSETSTables</Role>
      <ShortName>OTHER NON-CURRENT ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/OTHERNONCURRENTASSETS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - PAYABLES AND ACCRUED EXPENSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/PAYABLESANDACCRUEDEXPENSESTables</Role>
      <ShortName>PAYABLES AND ACCRUED EXPENSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/PAYABLESANDACCRUEDEXPENSES</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BORROWINGSTables</Role>
      <ShortName>BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/BORROWINGS</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - OTHER NON-CURRENT LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTLIABILITIESTables</Role>
      <ShortName>OTHER NON-CURRENT LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/OTHERNONCURRENTLIABILITIES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/INCOMETAXES</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSBYCOMPONENTTables</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/CHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSBYCOMPONENT</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - INTERIM FINANCIAL DATA BY SEGMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERIMFINANCIALDATABYSEGMENTTables</Role>
      <ShortName>INTERIM FINANCIAL DATA BY SEGMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/INTERIMFINANCIALDATABYSEGMENT</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - BASIS OF PRESENTATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BASISOFPRESENTATIONDetails</Role>
      <ShortName>BASIS OF PRESENTATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/BASISOFPRESENTATIONPolicies</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - NEW ACCOUNTING PRONOUNCEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/NEWACCOUNTINGPRONOUNCEMENTSDetails</Role>
      <ShortName>NEW ACCOUNTING PRONOUNCEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/NEWACCOUNTINGPRONOUNCEMENTS</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - REVENUE RECOGNITION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/REVENUERECOGNITIONAdditionalInformationDetails</Role>
      <ShortName>REVENUE RECOGNITION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - REVENUE RECOGNITION - Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/REVENUERECOGNITIONDisaggregationofRevenueDetails</Role>
      <ShortName>REVENUE RECOGNITION - Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - REVENUE RECOGNITION - Contract Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/REVENUERECOGNITIONContractAssetsandLiabilitiesDetails</Role>
      <ShortName>REVENUE RECOGNITION - Contract Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - WEIGHTED-AVERAGE SHARES OUTSTANDING - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/WEIGHTEDAVERAGESHARESOUTSTANDINGAdditionalInformationDetails</Role>
      <ShortName>WEIGHTED-AVERAGE SHARES OUTSTANDING - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - WEIGHTED-AVERAGE SHARES OUTSTANDING - Denominators of Basic and Diluted EPS Computations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/WEIGHTEDAVERAGESHARESOUTSTANDINGDenominatorsofBasicandDilutedEPSComputationsDetails</Role>
      <ShortName>WEIGHTED-AVERAGE SHARES OUTSTANDING - Denominators of Basic and Diluted EPS Computations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - INTEREST EXPENSE, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERESTEXPENSENETDetails</Role>
      <ShortName>INTEREST EXPENSE, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/INTERESTEXPENSENETTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - ACQUISITIONS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/ACQUISITIONSAdditionalInformationDetails</Role>
      <ShortName>ACQUISITIONS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - ACQUISITIONS - Schedule of Business Combination, Financial Information on Transaction (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/ACQUISITIONSScheduleofBusinessCombinationFinancialInformationonTransactionDetails</Role>
      <ShortName>ACQUISITIONS - Schedule of Business Combination, Financial Information on Transaction (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAdditionalInformationDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Canton Coin Holding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofCantonCoinHoldingDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Canton Coin Holding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofChangesinLevel3FinancialAssetsandLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - DEFERRED CLIENT CONVERSION AND START-UP COSTS - Schedule of Deferred Client Conversion and Start-Up Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/DEFERREDCLIENTCONVERSIONANDSTARTUPCOSTSScheduleofDeferredClientConversionandStartUpCostsDetails</Role>
      <ShortName>DEFERRED CLIENT CONVERSION AND START-UP COSTS - Schedule of Deferred Client Conversion and Start-Up Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - DEFERRED CLIENT CONVERSION AND START-UP COSTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/DEFERREDCLIENTCONVERSIONANDSTARTUPCOSTSAdditionalInformationDetails</Role>
      <ShortName>DEFERRED CLIENT CONVERSION AND START-UP COSTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - OTHER NON-CURRENT ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTASSETSDetails</Role>
      <ShortName>OTHER NON-CURRENT ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/OTHERNONCURRENTASSETSTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - PAYABLES AND ACCRUED EXPENSES - Components of Payables and Accrued Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/PAYABLESANDACCRUEDEXPENSESComponentsofPayablesandAccruedExpensesDetails</Role>
      <ShortName>PAYABLES AND ACCRUED EXPENSES - Components of Payables and Accrued Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - PAYABLES AND ACCRUED EXPENSES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/PAYABLESANDACCRUEDEXPENSESAdditionalInformationDetails</Role>
      <ShortName>PAYABLES AND ACCRUED EXPENSES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - BORROWINGS - Schedule of Outstanding Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BORROWINGSScheduleofOutstandingBorrowingsDetails</Role>
      <ShortName>BORROWINGS - Schedule of Outstanding Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - BORROWINGS - Future Principal Payments on Outstanding Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BORROWINGSFuturePrincipalPaymentsonOutstandingDebtDetails</Role>
      <ShortName>BORROWINGS - Future Principal Payments on Outstanding Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - BORROWINGS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/BORROWINGSAdditionalInformationDetails</Role>
      <ShortName>BORROWINGS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - OTHER NON-CURRENT LIABILITIES - Schedule of Other Noncurrent Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTLIABILITIESScheduleofOtherNoncurrentLiabilitiesDetails</Role>
      <ShortName>OTHER NON-CURRENT LIABILITIES - Schedule of Other Noncurrent Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - OTHER NON-CURRENT LIABILITIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/OTHERNONCURRENTLIABILITIESAdditionalInformationDetails</Role>
      <ShortName>OTHER NON-CURRENT LIABILITIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Incentive Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/STOCKBASEDCOMPENSATIONScheduleofIncentiveAwardsDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Schedule of Incentive Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/STOCKBASEDCOMPENSATIONAdditionalInformationDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/INCOMETAXESTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - CONTRACTUAL COMMITMENTS, CONTINGENCIES AND OFF-BALANCE SHEET ARRANGEMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CONTRACTUALCOMMITMENTSCONTINGENCIESANDOFFBALANCESHEETARRANGEMENTSDetails</Role>
      <ShortName>CONTRACTUAL COMMITMENTS, CONTINGENCIES AND OFF-BALANCE SHEET ARRANGEMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/CONTRACTUALCOMMITMENTSCONTINGENCIESANDOFFBALANCESHEETARRANGEMENTS</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/CHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSBYCOMPONENTDetails</Role>
      <ShortName>CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) BY COMPONENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/CHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSBYCOMPONENTTables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - INTERIM FINANCIAL DATA BY SEGMENT - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/INTERIMFINANCIALDATABYSEGMENTAdditionalInformationDetails</Role>
      <ShortName>INTERIM FINANCIAL DATA BY SEGMENT - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - Interim Financial Data by Segment - Schedule of Financial Data Segment Reporting Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/InterimFinancialDatabySegmentScheduleofFinancialDataSegmentReportingInformationDetails</Role>
      <ShortName>Interim Financial Data by Segment - Schedule of Financial Data Segment Reporting Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="br-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - SUBSEQUENT EVENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.broadridge.com/role/SUBSEQUENTEVENTDetails</Role>
      <ShortName>SUBSEQUENT EVENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.broadridge.com/role/SUBSEQUENTEVENT</ParentRole>
      <Position>75</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="10-Q" isDefinitelyFs="true" isUsgaap="true" original="br-20260331.htm">br-20260331.htm</File>
    <File>br-20260331.xsd</File>
    <File>br-20260331_cal.xml</File>
    <File>br-20260331_def.xml</File>
    <File>br-20260331_lab.xml</File>
    <File>br-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1046">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
