<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>363</ContextCount>
  <ElementCount>549</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>128</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="notv-20240930.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.inotivco.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - DESCRIPTION OF THE BUSINESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DESCRIPTIONOFTHEBUSINESS</Role>
      <ShortName>DESCRIPTION OF THE BUSINESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - BUSINESS COMBINATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BUSINESSCOMBINATIONS</Role>
      <ShortName>BUSINESS COMBINATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - REVENUE FROM CONTRACTS WITH CLIENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/REVENUEFROMCONTRACTSWITHCLIENTS</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CLIENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATION</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBT</Role>
      <ShortName>DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATION</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - POST EMPLOYMENT BENEFITS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITS</Role>
      <ShortName>POST EMPLOYMENT BENEFITS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - OTHER OPERATING EXPENSE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/OTHEROPERATINGEXPENSE</Role>
      <ShortName>OTHER OPERATING EXPENSE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - RESTRUCTURING AND ASSETS HELD FOR SALE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/RESTRUCTURINGANDASSETSHELDFORSALE</Role>
      <ShortName>RESTRUCTURING AND ASSETS HELD FOR SALE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - STOCKHOLDERS EQUITY AND LOSS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKHOLDERSEQUITYANDLOSSPERSHARE</Role>
      <ShortName>STOCKHOLDERS EQUITY AND LOSS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONTINGENCIES</Role>
      <ShortName>CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.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>26</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.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>27</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.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>28</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - BUSINESS COMBINATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BUSINESSCOMBINATIONSTables</Role>
      <ShortName>BUSINESS COMBINATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/BUSINESSCOMBINATIONS</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - REVENUE FROM CONTRACTS WITH CLIENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/REVENUEFROMCONTRACTSWITHCLIENTSTables</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CLIENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/REVENUEFROMCONTRACTSWITHCLIENTS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATIONTables</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATION</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETS</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTTables</Role>
      <ShortName>DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/DEBT</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONTables</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATION</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - POST EMPLOYMENT BENEFITS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSTables</Role>
      <ShortName>POST EMPLOYMENT BENEFITS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITS</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - OTHER OPERATING EXPENSE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/OTHEROPERATINGEXPENSETables</Role>
      <ShortName>OTHER OPERATING EXPENSE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/OTHEROPERATINGEXPENSE</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/LEASES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - STOCKHOLDERS EQUITY AND LOSS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKHOLDERSEQUITYANDLOSSPERSHARETables</Role>
      <ShortName>STOCKHOLDERS EQUITY AND LOSS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/STOCKHOLDERSEQUITYANDLOSSPERSHARE</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - STOCK-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONTables</Role>
      <ShortName>STOCK-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/INCOMETAXES</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - DESCRIPTION OF THE BUSINESS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DESCRIPTIONOFTHEBUSINESSDetails</Role>
      <ShortName>DESCRIPTION OF THE BUSINESS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/DESCRIPTIONOFTHEBUSINESS</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment Estimated Useful Lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPropertyPlantandEquipmentEstimatedUsefulLivesDetails</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment Estimated Useful Lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets Estimated Useful Lives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESIntangibleAssetsEstimatedUsefulLivesDetails</Role>
      <ShortName>BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets Estimated Useful Lives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - BUSINESS COMBINATIONS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BUSINESSCOMBINATIONSNarrativeDetails</Role>
      <ShortName>BUSINESS COMBINATIONS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - BUSINESS COMBINATIONS - Final determination of fair value of assets acquired and liabilities assumed (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/BUSINESSCOMBINATIONSFinaldeterminationoffairvalueofassetsacquiredandliabilitiesassumedDetails</Role>
      <ShortName>BUSINESS COMBINATIONS - Final determination of fair value of assets acquired and liabilities assumed (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - REVENUE FROM CONTRACTS WITH CLIENTS - Contract Assets and Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/REVENUEFROMCONTRACTSWITHCLIENTSContractAssetsandContractLiabilitiesDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CLIENTS - Contract Assets and Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - REVENUE FROM CONTRACTS WITH CLIENTS - Activity in Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/REVENUEFROMCONTRACTSWITHCLIENTSActivityinAllowanceforCreditLossesDetails</Role>
      <ShortName>REVENUE FROM CONTRACTS WITH CLIENTS - Activity in Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATIONNarrativeDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments Revenue and Operating Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATIONOperatingSegmentsRevenueandOperatingIncomeLossDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION - Operating Segments Revenue and Operating Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Geographic Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SEGMENTANDGEOGRAPHICINFORMATIONGeographicInformationDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION - Geographic Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETSGoodwillRollforwardDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Goodwill Rollforward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, net by major class (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETSIntangibleAssetsnetbymajorclassDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, net by major class (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/GOODWILLANDINTANGIBLEASSETSAmortizationofintangibleassetsDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Amortization of intangible assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - DEBT - Schedule of long-term debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTScheduleoflongtermdebtDetails</Role>
      <ShortName>DEBT - Schedule of long-term debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - DEBT - Aggregate amount of maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTAggregateamountofmaturitiesDetails</Role>
      <ShortName>DEBT - Aggregate amount of maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - DEBT - Significant Transactions Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTSignificantTransactionsNarrativeDetails</Role>
      <ShortName>DEBT - Significant Transactions Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - DEBT - Fair Value Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTFairValueNarrativeDetails</Role>
      <ShortName>DEBT - Fair Value Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - DEBT - Revolving Credit Facility and Amendments Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTRevolvingCreditFacilityandAmendmentsNarrativeDetails</Role>
      <ShortName>DEBT - Revolving Credit Facility and Amendments Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - DEBT - Convertible Senior Notes Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.inotivco.com/role/DEBTConvertibleSeniorNotesNarrativeDetails</Role>
      <ShortName>DEBT - Convertible Senior Notes Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - DEBT - Acquisition Related Debt Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/DEBTAcquisitionRelatedDebtNarrativeDetails</Role>
      <ShortName>DEBT - Acquisition Related Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONNarrativeDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Trade Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONTradeReceivablesDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Trade Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONInventoriesDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid Expenses and Other Current Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONPrepaidExpensesandOtherCurrentAssetsDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Prepaid Expenses and Other Current Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONCompositionofOtherAssetsDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONCompositionofPropertyandEquipmentDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Composition of Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONAccruedExpensesDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Fees Invoiced in Advance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONFeesInvoicedinAdvanceDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Fees Invoiced in Advance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - SUPPLEMENTAL BALANCE SHEET INFORMATION - Other Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/SUPPLEMENTALBALANCESHEETINFORMATIONOtherLiabilitiesDetails</Role>
      <ShortName>SUPPLEMENTAL BALANCE SHEET INFORMATION - Other Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - POST EMPLOYMENT BENEFITS - Reconciliation of Projected Benefit Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSReconciliationofProjectedBenefitObligationsDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Reconciliation of Projected Benefit Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - POST EMPLOYMENT BENEFITS - Net periodic benefit costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSNetperiodicbenefitcostsDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Net periodic benefit costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - POST EMPLOYMENT BENEFITS - Major assumptions used in determining the net periodic benefit costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSMajorassumptionsusedindeterminingthenetperiodicbenefitcostsDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Major assumptions used in determining the net periodic benefit costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - POST EMPLOYMENT BENEFITS - Discount rate and Rate of compensation increases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSDiscountrateandRateofcompensationincreasesDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Discount rate and Rate of compensation increases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - POST EMPLOYMENT BENEFITS - Plan assets distribution (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSPlanassetsdistributionDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Plan assets distribution (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>9955561 - Disclosure - POST EMPLOYMENT BENEFITS - Fair value of total plan assets by asset category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSFairvalueoftotalplanassetsbyassetcategoryDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Fair value of total plan assets by asset category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>9955562 - Disclosure - POST EMPLOYMENT BENEFITS - Pension Funding and Payments and Defined Contribution Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/POSTEMPLOYMENTBENEFITSPensionFundingandPaymentsandDefinedContributionPlansDetails</Role>
      <ShortName>POST EMPLOYMENT BENEFITS - Pension Funding and Payments and Defined Contribution Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>9955563 - Disclosure - OTHER OPERATING EXPENSE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/OTHEROPERATINGEXPENSEDetails</Role>
      <ShortName>OTHER OPERATING EXPENSE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/OTHEROPERATINGEXPENSETables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>9955564 - Disclosure - RESTRUCTURING AND ASSETS HELD FOR SALE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/RESTRUCTURINGANDASSETSHELDFORSALEDetails</Role>
      <ShortName>RESTRUCTURING AND ASSETS HELD FOR SALE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/RESTRUCTURINGANDASSETSHELDFORSALE</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>9955565 - Disclosure - LEASES - Right-of-use lease assets and lease liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESRightofuseleaseassetsandleaseliabilitiesDetails</Role>
      <ShortName>LEASES - Right-of-use lease assets and lease liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>9955566 - Disclosure - LEASES - Components of lease expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESComponentsofleaseexpenseDetails</Role>
      <ShortName>LEASES - Components of lease expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>9955567 - Disclosure - LEASES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESNarrativeDetails</Role>
      <ShortName>LEASES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>9955568 - Disclosure - LEASES - Supplemental cash flow information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESSupplementalcashflowinformationDetails</Role>
      <ShortName>LEASES - Supplemental cash flow information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>9955569 - Disclosure - LEASES - Weighted average remaining lease term and discount rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESWeightedaverageremainingleasetermanddiscountrateDetails</Role>
      <ShortName>LEASES - Weighted average remaining lease term and discount rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>9955570 - Disclosure - LEASES - Maturities of operating and finance lease (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/LEASESMaturitiesofoperatingandfinanceleaseDetails</Role>
      <ShortName>LEASES - Maturities of operating and finance lease (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>9955571 - Disclosure - STOCKHOLDERS EQUITY AND LOSS PER SHARE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKHOLDERSEQUITYANDLOSSPERSHARENarrativeDetails</Role>
      <ShortName>STOCKHOLDERS EQUITY AND LOSS PER SHARE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>9955572 - Disclosure - STOCKHOLDERS EQUITY AND LOSS PER SHARE - Basic and diluted net (loss) income per share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKHOLDERSEQUITYANDLOSSPERSHAREBasicanddilutednetlossincomepershareDetails</Role>
      <ShortName>STOCKHOLDERS EQUITY AND LOSS PER SHARE - Basic and diluted net (loss) income per share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>9955573 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>9955574 - Disclosure - STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONStockBasedCompensationExpenseDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>9955575 - Disclosure - STOCK-BASED COMPENSATION - Weighted-Average Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONWeightedAverageFairValueDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Weighted-Average Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>9955576 - Disclosure - STOCK-BASED COMPENSATION - Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONStockOptionActivityDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>9955577 - Disclosure - STOCK-BASED COMPENSATION - Restricted Shares and Restricted Stock Units Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/STOCKBASEDCOMPENSATIONRestrictedSharesandRestrictedStockUnitsActivityDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION - Restricted Shares and Restricted Stock Units Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>9955578 - Disclosure - INCOME TAXES - Components of loss (income) before income taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESComponentsoflossincomebeforeincometaxesDetails</Role>
      <ShortName>INCOME TAXES - Components of loss (income) before income taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>9955579 - Disclosure - INCOME TAXES - Deferred tax assets and liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESDeferredtaxassetsandliabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Deferred tax assets and liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>9955580 - Disclosure - INCOME TAXES - Provision (benefit) for income taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESProvisionbenefitforincometaxesDetails</Role>
      <ShortName>INCOME TAXES - Provision (benefit) for income taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>9955581 - Disclosure - INCOME TAXES - Effective income tax rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESEffectiveincometaxrateDetails</Role>
      <ShortName>INCOME TAXES - Effective income tax rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>9955582 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="notv-20240930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>9955583 - Disclosure - CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.inotivco.com/role/CONTINGENCIESDetails</Role>
      <ShortName>CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.inotivco.com/role/CONTINGENCIES</ParentRole>
      <Position>101</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="notv-20240930.htm">notv-20240930.htm</File>
    <File>notv-20240930.xsd</File>
    <File>notv-20240930_cal.xml</File>
    <File>notv-20240930_def.xml</File>
    <File>notv-20240930_lab.xml</File>
    <File>notv-20240930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="1128">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2024</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
