<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>830</ContextCount>
  <ElementCount>648</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>132</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Statements of Financial Condition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofFinancialCondition</Role>
      <ShortName>Consolidated Statements of Financial Condition</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Statements of Financial Condition (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofFinancialConditionParenthetical</Role>
      <ShortName>Consolidated Statements of Financial Condition (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofChangesinStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofChangesinStockholdersEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - DIVESTITURES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/DIVESTITURES</Role>
      <ShortName>DIVESTITURES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - SECURITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SECURITIES</Role>
      <ShortName>SECURITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - LOANS AND LEASES, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNET</Role>
      <ShortName>LOANS AND LEASES, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - EARNINGS PER COMMON SHARE ("EPS")</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/EARNINGSPERCOMMONSHAREEPS</Role>
      <ShortName>EARNINGS PER COMMON SHARE ("EPS")</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - PREMISES, FURNITURE, AND EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PREMISESFURNITUREANDEQUIPMENTNET</Role>
      <ShortName>PREMISES, FURNITURE, AND EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - RENTAL EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/RENTALEQUIPMENTNET</Role>
      <ShortName>RENTAL EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIES</Role>
      <ShortName>OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - TIME CERTIFICATES OF DEPOSIT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/TIMECERTIFICATESOFDEPOSIT</Role>
      <ShortName>TIME CERTIFICATES OF DEPOSIT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - SHORT-TERM AND LONG-TERM BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGS</Role>
      <ShortName>SHORT-TERM AND LONG-TERM BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKHOLDERSEQUITY</Role>
      <ShortName>STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - STOCK COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATION</Role>
      <ShortName>STOCK COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGS</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERS</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - SEGMENT REPORTING</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SEGMENTREPORTING</Role>
      <ShortName>SEGMENT REPORTING</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTS</Role>
      <ShortName>PARENT COMPANY FINANCIAL STATEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9952176 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SELECTEDQUARTERLYFINANCIALDATAUNAUDITED</Role>
      <ShortName>SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9952177 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9952178 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.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>31</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - DIVESTITURES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/DIVESTITURESTables</Role>
      <ShortName>DIVESTITURES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/DIVESTITURES</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - SECURITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SECURITIESTables</Role>
      <ShortName>SECURITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SECURITIES</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - LOANS AND LEASES, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETTables</Role>
      <ShortName>LOANS AND LEASES, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/LOANSANDLEASESNET</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - EARNINGS PER COMMON SHARE ("EPS") (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/EARNINGSPERCOMMONSHAREEPSTables</Role>
      <ShortName>EARNINGS PER COMMON SHARE ("EPS") (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/EARNINGSPERCOMMONSHAREEPS</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - PREMISES, FURNITURE, AND EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PREMISESFURNITUREANDEQUIPMENTNETTables</Role>
      <ShortName>PREMISES, FURNITURE, AND EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/PREMISESFURNITUREANDEQUIPMENTNET</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - RENTAL EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/RENTALEQUIPMENTNETTables</Role>
      <ShortName>RENTAL EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/RENTALEQUIPMENTNET</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETS</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIESTables</Role>
      <ShortName>OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIES</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - TIME CERTIFICATES OF DEPOSIT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/TIMECERTIFICATESOFDEPOSITTables</Role>
      <ShortName>TIME CERTIFICATES OF DEPOSIT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/TIMECERTIFICATESOFDEPOSIT</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - SHORT-TERM AND LONG-TERM BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGSTables</Role>
      <ShortName>SHORT-TERM AND LONG-TERM BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGS</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - STOCK COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATIONTables</Role>
      <ShortName>STOCK COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/STOCKCOMPENSATION</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/INCOMETAXES</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSTables</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGS</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSTables</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERS</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - SEGMENT REPORTING (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SEGMENTREPORTINGTables</Role>
      <ShortName>SEGMENT REPORTING (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SEGMENTREPORTING</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTSTables</Role>
      <ShortName>PARENT COMPANY FINANCIAL STATEMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTS</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SELECTEDQUARTERLYFINANCIALDATAUNAUDITEDTables</Role>
      <ShortName>SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SELECTEDQUARTERLYFINANCIALDATAUNAUDITED</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets of VIE's (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAssetsofVIEsDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets of VIE's (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - DIVESTITURES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/DIVESTITURESNarrativeDetails</Role>
      <ShortName>DIVESTITURES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - DIVESTITURES - Schedule of Insurance Premium Finance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/DIVESTITURESScheduleofInsurancePremiumFinanceDetails</Role>
      <ShortName>DIVESTITURES - Schedule of Insurance Premium Finance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SECURITIES - Schedule of Securities Available (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SECURITIESScheduleofSecuritiesAvailableDetails</Role>
      <ShortName>SECURITIES - Schedule of Securities Available (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - SECURITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SECURITIESNarrativeDetails</Role>
      <ShortName>SECURITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - SECURITIES - Activities Related to Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SECURITIESActivitiesRelatedtoSaleDetails</Role>
      <ShortName>SECURITIES - Activities Related to Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - LOANS AND LEASES, NET - Summary of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETSummaryofLoansDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Summary of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - LOANS AND LEASES, NET - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETAdditionalInformationDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETScheduleofLoansPurchasedandSoldbyPortfolioSegmentDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETDirectFinancingandSalestypeLeasesandLeaseReceivableMaturityDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Direct Financing and Sales-type Leases, and Lease Receivable Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - LOANS AND LEASES, NET - Allowance for Loan Losses and Recorded Investment in Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETAllowanceforLoanLossesandRecordedInvestmentinLoansDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Allowance for Loan Losses and Recorded Investment in Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - LOANS AND LEASES, NET - Impaired Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETImpairedLoansDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Impaired Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - LOANS AND LEASES, NET -Asset Classification of Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETAssetClassificationofLoansDetails</Role>
      <ShortName>LOANS AND LEASES, NET -Asset Classification of Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - LOANS AND LEASES, NET - Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETPastDueLoansDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - LOANS AND LEASES, NET - Nonaccrual (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/LOANSANDLEASESNETNonaccrualDetails</Role>
      <ShortName>LOANS AND LEASES, NET - Nonaccrual (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - EARNINGS PER COMMON SHARE ("EPS") (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/EARNINGSPERCOMMONSHAREEPSDetails</Role>
      <ShortName>EARNINGS PER COMMON SHARE ("EPS") (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/EARNINGSPERCOMMONSHAREEPSTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - PREMISES, FURNITURE, AND EQUIPMENT, NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PREMISESFURNITUREANDEQUIPMENTNETDetails</Role>
      <ShortName>PREMISES, FURNITURE, AND EQUIPMENT, NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/PREMISESFURNITUREANDEQUIPMENTNETTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - RENTAL EQUIPMENT, NET - Schedule of Rental Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/RENTALEQUIPMENTNETScheduleofRentalEquipmentDetails</Role>
      <ShortName>RENTAL EQUIPMENT, NET - Schedule of Rental Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - RENTAL EQUIPMENT, NET - Schedule of Operating Leases, Future Minimum Payments Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/RENTALEQUIPMENTNETScheduleofOperatingLeasesFutureMinimumPaymentsReceivableDetails</Role>
      <ShortName>RENTAL EQUIPMENT, NET - Schedule of Operating Leases, Future Minimum Payments Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Asses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssesDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Asses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofFutureAmortizationDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Future Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIESNarrativeDetails</Role>
      <ShortName>OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIESTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIESLeaseMaturityDetails</Role>
      <ShortName>OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/OPERATINGLEASERIGHTOFUSEASSETSANDLIABILITIESLeaseCostsDetails</Role>
      <ShortName>OPERATING LEASE RIGHT-OF-USE ASSETS AND LIABILITIES - Lease Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - TIME CERTIFICATES OF DEPOSIT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/TIMECERTIFICATESOFDEPOSITDetails</Role>
      <ShortName>TIME CERTIFICATES OF DEPOSIT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/TIMECERTIFICATESOFDEPOSITTables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGSShortTermDebtDetails</Role>
      <ShortName>SHORT-TERM AND LONG-TERM BORROWINGS - Short Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGSLongTermDebtDetails</Role>
      <ShortName>SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SHORTTERMANDLONGTERMBORROWINGSLongTermDebtNarrativeDetails</Role>
      <ShortName>SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - STOCKHOLDERS' EQUITY (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKHOLDERSEQUITYDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/STOCKHOLDERSEQUITY</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - STOCK COMPENSATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATIONAdditionalInformationDetails</Role>
      <ShortName>STOCK COMPENSATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - STOCK COMPENSATION - Nonvested Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATIONNonvestedSharesDetails</Role>
      <ShortName>STOCK COMPENSATION - Nonvested Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - STOCK COMPENSATION - Performance Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATIONPerformanceSharesDetails</Role>
      <ShortName>STOCK COMPENSATION - Performance Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - STOCK COMPENSATION - Effects to Net Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/STOCKCOMPENSATIONEffectstoNetIncomeDetails</Role>
      <ShortName>STOCK COMPENSATION - Effects to Net Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/INCOMETAXESTables</ParentRole>
      <Position>90</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSFinancialMeasuresofCapitalDetails</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/CAPITALREQUIREMENTSANDRESTRICTIONSONRETAINEDEARNINGSReconciliationofCapitalAmountsDetails</Role>
      <ShortName>CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Reconciliation of Capital Amounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenue From Contracts with Customers by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSScheduleofRevenueFromContractswithCustomersbySegmentDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenue From Contracts with Customers by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - SEGMENT REPORTING (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SEGMENTREPORTINGDetails</Role>
      <ShortName>SEGMENT REPORTING (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SEGMENTREPORTINGTables</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTSBalanceSheetDetails</Role>
      <ShortName>PARENT COMPANY FINANCIAL STATEMENTS - Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Income Statement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTSIncomeStatementDetails</Role>
      <ShortName>PARENT COMPANY FINANCIAL STATEMENTS - Income Statement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/PARENTCOMPANYFINANCIALSTATEMENTSCashFlowStatementDetails</Role>
      <ShortName>PARENT COMPANY FINANCIAL STATEMENTS - Cash Flow Statement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SELECTEDQUARTERLYFINANCIALDATAUNAUDITEDDetails</Role>
      <ShortName>SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SELECTEDQUARTERLYFINANCIALDATAUNAUDITEDTables</ParentRole>
      <Position>99</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS- Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS- Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTSAssetsMeasuredatFairValueonRecurringDetails</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTSQuantitativeInformationDetails</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/FAIRVALUESOFFINANCIALINSTRUMENTSBalanceSheetGroupingDetails</Role>
      <ShortName>FAIR VALUES OF FINANCIAL INSTRUMENTS - Balance Sheet Grouping (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="cash-20250930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - SUBSEQUENT EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.metafinancialgroup.com/role/SUBSEQUENTEVENTSDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.metafinancialgroup.com/role/SUBSEQUENTEVENTS</ParentRole>
      <Position>104</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-K" isDefinitelyFs="true" isUsgaap="true" original="cash-20250930.htm">cash-20250930.htm</File>
    <File>cash-20250930.xsd</File>
    <File>cash-20250930_cal.xml</File>
    <File>cash-20250930_def.xml</File>
    <File>cash-20250930_lab.xml</File>
    <File>cash-20250930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>cash-20250930_g1.jpg</File>
    <File>cash-20250930_g2.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="5">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="3638">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2025</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
