<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>192</ContextCount>
  <ElementCount>299</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>53</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedStatementsofOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - Consolidated Statements of Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedStatementsofComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75060 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedStatementsofStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75070 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/ConsolidatedStatementsofCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.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>8</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995467 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBasisOfPresentation</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995477 - Disclosure - BUSINESS COMBINATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBusinessCombination</Role>
      <ShortName>BUSINESS COMBINATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995497 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenue1</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995507 - Disclosure - CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CONCENTRATIONOFCREDITRISKANDSIGNIFICANTCUSTOMERS</Role>
      <ShortName>CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995517 - Disclosure - SHARE-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureSharebasedCompensation</Role>
      <ShortName>SHARE-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995527 - Disclosure - CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTS</Role>
      <ShortName>CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995537 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995547 - Disclosure - INVENTORIES AND DEFERRED COSTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/INVENTORIESANDDEFERREDCOSTS</Role>
      <ShortName>INVENTORIES AND DEFERRED COSTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995577 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995587 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995597 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LONGTERMDEBT</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995607 - Disclosure - RESTRUCTURING CHARGES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/RESTRUCTURINGCHARGES</Role>
      <ShortName>RESTRUCTURING CHARGES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995617 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995627 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995637 - Disclosure - TREASURY STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/TREASURYSTOCK</Role>
      <ShortName>TREASURY STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995647 - Disclosure - NET INCOME (LOSS) PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/NETINCOMELOSSPERSHARE</Role>
      <ShortName>NET INCOME (LOSS) PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995657 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995667 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/SEGMENTANDGEOGRAPHICINFORMATION</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995697 - Disclosure - BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBasisOfPresentationPolicies</Role>
      <ShortName>BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995707 - Disclosure - BUSINESS COMBINATION (Table)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBusinessCombinationTable</Role>
      <ShortName>BUSINESS COMBINATION (Table)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/DisclosureBusinessCombination</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995717 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenueTables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenue1</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995727 - Disclosure - SHARE-BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureSharebasedCompensationTables</Role>
      <ShortName>SHARE-BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/DisclosureSharebasedCompensation</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995737 - Disclosure - CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTSTables</Role>
      <ShortName>CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995747 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/FAIRVALUEMEASUREMENTSTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995757 - Disclosure - INVENTORIES AND DEFERRED COSTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/INVENTORIESANDDEFERREDCOSTSTables</Role>
      <ShortName>INVENTORIES AND DEFERRED COSTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/INVENTORIESANDDEFERREDCOSTS</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995777 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995787 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivities</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995797 - Disclosure - RESTRUCTURING CHARGES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/RESTRUCTURINGCHARGESTables</Role>
      <ShortName>RESTRUCTURING CHARGES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/RESTRUCTURINGCHARGES</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995807 - Disclosure - STOCK PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureStockPlansTables</Role>
      <ShortName>STOCK PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995827 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/LEASES</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995837 - Disclosure - NET INCOME (LOSS) PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/NETINCOMELOSSPERSHARETables</Role>
      <ShortName>NET INCOME (LOSS) PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/NETINCOMELOSSPERSHARE</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995847 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/SEGMENTANDGEOGRAPHICINFORMATIONTables</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/SEGMENTANDGEOGRAPHICINFORMATION</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995857 - Disclosure - BUSINESS COMBINATION - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBusinessCombinationAdditionalInformationDetail</Role>
      <ShortName>BUSINESS COMBINATION - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995867 - Disclosure - BUSINESS COMBINATION - Schedule of the purchase price to the identifiable assets acquired and liabilities assumed based on their estimated fair values (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureBusinessCombinationScheduleOfThePurchasePriceToTheIdentifiableAssetsAcquiredAndLiabilitiesAssumedBasedOnTheirEstimatedFairValue</Role>
      <ShortName>BUSINESS COMBINATION - Schedule of the purchase price to the identifiable assets acquired and liabilities assumed based on their estimated fair values (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995877 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995887 - Disclosure - REVENUE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenueNarrativeDetails</Role>
      <ShortName>REVENUE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995897 - Disclosure - REVENUE - Performance Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenuePerformanceObligationsDetails</Role>
      <ShortName>REVENUE - Performance Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995907 - Disclosure - REVENUE - Schedule of Allowance for Credit Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureRevenueScheduleOfAllowanceForCreditLossesDetails</Role>
      <ShortName>REVENUE - Schedule of Allowance for Credit Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995917 - Disclosure - CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureConcentrationOfCreditRiskAndSignificantCustomersNarrativeDetails</Role>
      <ShortName>CONCENTRATION OF CREDIT RISK AND SIGNIFICANT CUSTOMERS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/CONCENTRATIONOFCREDITRISKANDSIGNIFICANTCUSTOMERS</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995927 - Disclosure - SHARE-BASED COMPENSATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureSharebasedCompensationNarrativeDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995937 - Disclosure - SHARE-BASED COMPENSATION - Schedule of Share-Based Compensation Cost and Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureSharebasedCompensationScheduleOfSharebasedCompensationCostAndExpenseDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION - Schedule of Share-Based Compensation Cost and Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995947 - Disclosure - CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS- Schedule of Marketable Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTSScheduleofMarketableSecuritiesDetails</Role>
      <ShortName>CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS- Schedule of Marketable Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995957 - Disclosure - CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS - Schedule of Contractual Maturities of Marketable Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTSScheduleofContractualMaturitiesofMarketableSecuritiesDetails</Role>
      <ShortName>CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS - Schedule of Contractual Maturities of Marketable Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995967 - Disclosure - CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTSNarrativeDetails</Role>
      <ShortName>CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/CASHCASHEQUIVALENTSMARKETABLESECURITIESANDINVESTMENTSTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995977 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/FAIRVALUEMEASUREMENTSScheduleofFinancialAssetsandLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>995987 - Disclosure - INVENTORIES AND DEFERRED COSTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/INVENTORIESANDDEFERREDCOSTSDetails</Role>
      <ShortName>INVENTORIES AND DEFERRED COSTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/INVENTORIESANDDEFERREDCOSTSTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996017 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996027 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSScheduleofChangesinCarryingAmountofGoodwillDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in Carrying Amount of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996037 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996047 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSScheduleofAmortizationExpenseDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996057 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Expected Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/GOODWILLANDINTANGIBLEASSETSScheduleofExpectedFutureAmortizationExpenseDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS - Schedule of Expected Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996067 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesNarrativeDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996077 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesScheduleOfNotionalAmountsAndFairValuesOfDerivativeInstrumentsOnConsolidatedBalanceSheet</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Notional Amounts and Fair Values of Derivative Instruments on Consolidated Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996087 - Disclosure - DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureDerivativeInstrumentsAndHedgingActivitiesScheduleOfEffectOfForeignExchangeForwardContractsOnOtherComprehensiveIncomeAndResultsOf</Role>
      <ShortName>DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Effect of Foreign Exchange Forward Contracts on Other Comprehensive Income and Results of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996097 - Disclosure - LONG-TERM DEBT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LONGTERMDEBTDetails</Role>
      <ShortName>LONG-TERM DEBT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/LONGTERMDEBT</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996107 - Disclosure - RESTRUCTURING CHARGES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/RESTRUCTURINGCHARGESNarrativeDetails</Role>
      <ShortName>RESTRUCTURING CHARGES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996117 - Disclosure - RESTRUCTURING CHARGES - Schedule of Restructuring Liability (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/RESTRUCTURINGCHARGESScheduleofRestructuringLiabilityDetails</Role>
      <ShortName>RESTRUCTURING CHARGES - Schedule of Restructuring Liability (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996127 - Disclosure - LEASES - Schedule of Components of Operating Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LEASESScheduleofComponentsofOperatingLeaseCostDetails</Role>
      <ShortName>LEASES - Schedule of Components of Operating Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996137 - Disclosure - LEASES - Schedule of Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LEASESScheduleofSupplementalCashFlowInformationDetails</Role>
      <ShortName>LEASES - Schedule of Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996147 - Disclosure - LEASES - Schedule of Future Minimum Payments Under Non-Cancellable Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/LEASESScheduleofFutureMinimumPaymentsUnderNonCancellableLeasesDetails</Role>
      <ShortName>LEASES - Schedule of Future Minimum Payments Under Non-Cancellable Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996157 - Disclosure - TREASURY STOCK (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/TREASURYSTOCKDetails</Role>
      <ShortName>TREASURY STOCK (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/TREASURYSTOCK</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996167 - Disclosure - NET INCOME (LOSS) PER SHARE - Schedule of Calculations of the Basic and Diluted Net Income (Loss) Per Share and Potential Common Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfCalculationsOfTheBasicAndDilutedNetIncomeLossPerShareAndPotentialCommonSharesDetails</Role>
      <ShortName>NET INCOME (LOSS) PER SHARE - Schedule of Calculations of the Basic and Diluted Net Income (Loss) Per Share and Potential Common Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/NETINCOMELOSSPERSHARETables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996177 - Disclosure - NET INCOME (LOSS) PER SHARE - Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfDilutedNetIncomeLossPerShareDetails</Role>
      <ShortName>NET INCOME (LOSS) PER SHARE - Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Income (Loss) Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.netscout.com/20260630/taxonomy/role/NETINCOMELOSSPERSHARETables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996187 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/DisclosureIncomeTaxesNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996197 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/SEGMENTANDGEOGRAPHICINFORMATIONNarrativeDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ntct-20260630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996207 - Disclosure - SEGMENT AND GEOGRAPHIC INFORMATION - Schedule of Total Revenue by Geography (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.netscout.com/20260630/taxonomy/role/SEGMENTANDGEOGRAPHICINFORMATIONScheduleofTotalRevenuebyGeographyDetails</Role>
      <ShortName>SEGMENT AND GEOGRAPHIC INFORMATION - Schedule of Total Revenue by Geography (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="ntct-20260630.htm">ntct-20260630.htm</File>
    <File>ntct-20260630.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="711">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="18">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
