<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.1.u1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>199</ContextCount>
  <ElementCount>305</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>59</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - DOCUMENT AND ENTITY INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/DOCUMENTANDENTITYINFORMATION</Role>
      <ShortName>DOCUMENT AND ENTITY INFORMATION</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDCONDENSEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - CONSOLIDATED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDCONDENSEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED CONDENSED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/BASISOFPRESENTATION</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Disclosure - BALANCE SHEET COMPONENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/BALANCESHEETCOMPONENTS</Role>
      <ShortName>BALANCE SHEET COMPONENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CASHCASHEQUIVALENTSRESTRICTEDCASHANDSHORTTERMINVESTMENTS</Role>
      <ShortName>CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - EQUITY INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EQUITYINVESTMENTS</Role>
      <ShortName>EQUITY INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - DERIVATIVES FINANCIAL INSTRUMENTS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSNotes</Role>
      <ShortName>DERIVATIVES FINANCIAL INSTRUMENTS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.kns.com/role/DEBTANDOTHEROBLIGATIONSDEBTANDOTHEROBLIGATIONSNotes</Role>
      <ShortName>DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANS</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - REVENUE AND CONTRACT BALANCES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/REVENUEANDCONTRACTBALANCES</Role>
      <ShortName>REVENUE AND CONTRACT BALANCES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATION</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSNotes</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - RESTRUCTURING AND CANCELLATION OF PROJECT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECT</Role>
      <ShortName>RESTRUCTURING AND CANCELLATION OF PROJECT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.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>24</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.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>25</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9954471 - Disclosure - BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/BASISOFPRESENTATIONPolicies</Role>
      <ShortName>BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9954472 - Disclosure - BALANCE SHEET COMPONENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/BALANCESHEETCOMPONENTSTables</Role>
      <ShortName>BALANCE SHEET COMPONENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/BALANCESHEETCOMPONENTS</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9954473 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9954474 - Disclosure - CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CASHCASHEQUIVALENTSRESTRICTEDCASHANDSHORTTERMINVESTMENTSTables</Role>
      <ShortName>CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/CASHCASHEQUIVALENTSRESTRICTEDCASHANDSHORTTERMINVESTMENTS</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954475 - Disclosure - EQUITY INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EQUITYINVESTMENTSTables</Role>
      <ShortName>EQUITY INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/EQUITYINVESTMENTS</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954476 - Disclosure - DERIVATIVES FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVES FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSNotes</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954477 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/LEASES</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954478 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTables</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954479 - Disclosure - REVENUE AND CONTRACT BALANCES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/REVENUEANDCONTRACTBALANCESTables</Role>
      <ShortName>REVENUE AND CONTRACT BALANCES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/REVENUEANDCONTRACTBALANCES</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954480 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954481 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/INCOMETAXES</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954482 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATIONTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/SEGMENTINFORMATION</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954483 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSTables</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSNotes</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954484 - Disclosure - RESTRUCTURING AND CANCELLATION OF PROJECT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECTTables</Role>
      <ShortName>RESTRUCTURING AND CANCELLATION OF PROJECT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECT</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954485 - Disclosure - BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/BALANCESHEETCOMPONENTSComponentsofsignificantbalancesheetaccountsDetails</Role>
      <ShortName>BALANCE SHEET COMPONENTS (Components of significant balance sheet accounts) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/BALANCESHEETCOMPONENTSTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954486 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Goodwill by Reportable Segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSGoodwillbyReportableSegmentDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Goodwill by Reportable Segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954487 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSNetintangibleassetsDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954488 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Estimated annual amortization expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSEstimatedannualamortizationexpenseDetails</Role>
      <ShortName>GOODWILL AND INTANGIBLE ASSETS (Estimated annual amortization expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/GOODWILLANDINTANGIBLEASSETSTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954489 - Disclosure - CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/CASHCASHEQUIVALENTSRESTRICTEDCASHANDSHORTTERMINVESTMENTSDetails</Role>
      <ShortName>CASH, CASH EQUIVALENTS, RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/CASHCASHEQUIVALENTSRESTRICTEDCASHANDSHORTTERMINVESTMENTSTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954490 - Disclosure - EQUITY INVESTMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EQUITYINVESTMENTSDetails</Role>
      <ShortName>EQUITY INVESTMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/EQUITYINVESTMENTSTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954491 - Disclosure - DERIVATIVES FINANCIAL INSTRUMENTS (Fair value of derivative instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSFairvalueofderivativeinstrumentsDetails</Role>
      <ShortName>DERIVATIVES FINANCIAL INSTRUMENTS (Fair value of derivative instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954492 - Disclosure - DERIVATIVES FINANCIAL INSTRUMENTS (Gain (loss) of derivative instruments) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSGainlossofderivativeinstrumentsDetails</Role>
      <ShortName>DERIVATIVES FINANCIAL INSTRUMENTS (Gain (loss) of derivative instruments) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/DERIVATIVESFINANCIALINSTRUMENTSTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954493 - Disclosure - LEASES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASESNarrativeDetails</Role>
      <ShortName>LEASES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954494 - Disclosure - LEASES - Lease Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASESLeaseExpenseDetails</Role>
      <ShortName>LEASES - Lease Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954495 - Disclosure - LEASES - Lease Terms and Discount Rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASESLeaseTermsandDiscountRatesDetails</Role>
      <ShortName>LEASES - Lease Terms and Discount Rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954496 - Disclosure - LEASES - Future Lease Payments After Adoption ASC 842 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/LEASESFutureLeasePaymentsAfterAdoptionASC842Details</Role>
      <ShortName>LEASES - Future Lease Payments After Adoption ASC 842 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954497 - Disclosure - DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/DEBTANDOTHEROBLIGATIONSDEBTANDOTHEROBLIGATIONSDetails</Role>
      <ShortName>DEBT AND OTHER OBLIGATIONS DEBT AND OTHER OBLIGATIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/DEBTANDOTHEROBLIGATIONSDEBTANDOTHEROBLIGATIONSNotes</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954498 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSNarrativeDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954499 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Accumulated other comprehensive income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSAccumulatedothercomprehensiveincomeDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Accumulated other comprehensive income) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9954500 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Restricted stock and common stock granted) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSRestrictedstockandcommonstockgrantedDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Restricted stock and common stock granted) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9954501 - Disclosure - SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTotalequitybasedcompensationexpenseDetails</Role>
      <ShortName>SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SHAREHOLDERSEQUITYANDEMPLOYEEBENEFITPLANSTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9954502 - Disclosure - REVENUE AND CONTRACT BALANCES - Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/REVENUEANDCONTRACTBALANCESContractAssetsDetails</Role>
      <ShortName>REVENUE AND CONTRACT BALANCES - Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9954503 - Disclosure - REVENUE AND CONTRACT BALANCES - Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/REVENUEANDCONTRACTBALANCESContractLiabilitiesDetails</Role>
      <ShortName>REVENUE AND CONTRACT BALANCES - Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9954504 - Disclosure - EARNINGS PER SHARE (Reconciliation of the shares used in the basic and diluted net income per share computation) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/EARNINGSPERSHAREReconciliationofthesharesusedinthebasicanddilutednetincomepersharecomputationDetails</Role>
      <ShortName>EARNINGS PER SHARE (Reconciliation of the shares used in the basic and diluted net income per share computation) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9954505 - Disclosure - INCOME TAXES (Provision for income taxes and the effective tax rate) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/INCOMETAXESProvisionforincometaxesandtheeffectivetaxrateDetails</Role>
      <ShortName>INCOME TAXES (Provision for income taxes and the effective tax rate) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/INCOMETAXESTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9954506 - Disclosure - SEGMENT INFORMATION (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATIONNarrativeDetails</Role>
      <ShortName>SEGMENT INFORMATION (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SEGMENTINFORMATIONTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9954507 - Disclosure - SEGMENT INFORMATION (Operating information by segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATIONOperatinginformationbysegmentDetails</Role>
      <ShortName>SEGMENT INFORMATION (Operating information by segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SEGMENTINFORMATIONTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9954508 - Disclosure - SEGMENT INFORMATION (Schedule of net revenue by Capital Equipment end markets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATIONScheduleofnetrevenuebyCapitalEquipmentendmarketsDetails</Role>
      <ShortName>SEGMENT INFORMATION (Schedule of net revenue by Capital Equipment end markets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SEGMENTINFORMATIONTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9954509 - Disclosure - SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/SEGMENTINFORMATIONCapitalexpendituresdepreciationandamortizationexpensebysegmentDetails</Role>
      <ShortName>SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/SEGMENTINFORMATIONTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9954510 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSReserveforproductwarrantyactivityDetails</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Reserve for product warranty activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9954511 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Obligations not reflected on the Consolidated Balance Sheet) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSObligationsnotreflectedontheConsolidatedBalanceSheetDetails</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Obligations not reflected on the Consolidated Balance Sheet) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9954512 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of net revenue) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSSignificantcustomerconcentrationsasapercentageofnetrevenueDetails</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of net revenue) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9954513 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of total accounts receivable) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSSignificantcustomerconcentrationsasapercentageoftotalaccountsreceivableDetails</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS (Significant customer concentrations as a percentage of total accounts receivable) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9954514 - Disclosure - COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/COMMITMENTSCONTINGENCIESANDCONCENTRATIONSNarrativeDetails</Role>
      <ShortName>COMMITMENTS, CONTINGENCIES AND CONCENTRATIONS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9954515 - Disclosure - RESTRUCTURING AND CANCELLATION OF PROJECT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECTDetails</Role>
      <ShortName>RESTRUCTURING AND CANCELLATION OF PROJECT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECTTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="klic-20240330.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9954516 - Disclosure - RESTRUCTURING AND CANCELLATION OF PROJECT - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.kns.com/role/RESTRUCTURINGANDCANCELLATIONOFPROJECTNarrativeDetails</Role>
      <ShortName>RESTRUCTURING AND CANCELLATION OF PROJECT - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 1 fact(s) appearing in ix:hidden were eligible for transformation: dei:DocumentPeriodEndDate -  klic-20240330.htm 4</Log>
  </Logs>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="klic-20240330.htm">klic-20240330.htm</File>
    <File>klic-20240330.xsd</File>
    <File>klic-20240330_cal.xml</File>
    <File>klic-20240330_def.xml</File>
    <File>klic-20240330_lab.xml</File>
    <File>klic-20240330_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2023</BaseTaxonomy>
    <BaseTaxonomy items="905">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="35">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
