<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>173</ContextCount>
  <ElementCount>424</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>56</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Document - Audit Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/AuditInformation</Role>
      <ShortName>Audit Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDBALANCESHEETS</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDBALANCESHEETSParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF OPERATIONS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSS</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952155 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVELOSSParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOW</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOW</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOW</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952157 - Statement - CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/CONSOLIDATEDSTATEMENTOFSHAREHOLDERSEQUITY</Role>
      <ShortName>CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SIGNIFICANTACCOUNTINGPOLICIES</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - INVENTORIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INVENTORIES</Role>
      <ShortName>INVENTORIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - PROPERTY, PLANT AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/PROPERTYPLANTANDEQUIPMENT</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - LONG-TERM DEBT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LONGTERMDEBT</Role>
      <ShortName>LONG-TERM DEBT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/EARNINGSPERSHARE</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - SHARE-BASED COMPENSATION AND BENEFIT PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANS</Role>
      <ShortName>SHARE-BASED COMPENSATION AND BENEFIT PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTS</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURES</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/REVENUE</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASES</Role>
      <ShortName>LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.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>23</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure</Role>
      <ShortName>Cybersecurity Risk Management and Strategy Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - INVENTORIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INVENTORIESTables</Role>
      <ShortName>INVENTORIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/INVENTORIES</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/PROPERTYPLANTANDEQUIPMENTTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/PROPERTYPLANTANDEQUIPMENT</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - LONG-TERM DEBT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LONGTERMDEBTTables</Role>
      <ShortName>LONG-TERM DEBT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/LONGTERMDEBT</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/INCOMETAXES</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/EARNINGSPERSHARETables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/EARNINGSPERSHARE</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANSTables</Role>
      <ShortName>SHARE-BASED COMPENSATION AND BENEFIT PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANS</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESTables</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURES</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/REVENUE</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASESTables</Role>
      <ShortName>LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/LEASES</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SIGNIFICANTACCOUNTINGPOLICIESDetails</Role>
      <ShortName>SIGNIFICANT ACCOUNTING POLICIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - INVENTORIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INVENTORIESNarrativeDetails</Role>
      <ShortName>INVENTORIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - INVENTORIES - Schedule of Components of Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INVENTORIESScheduleofComponentsofInventoriesDetails</Role>
      <ShortName>INVENTORIES - Schedule of Components of Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/PROPERTYPLANTANDEQUIPMENTDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/PROPERTYPLANTANDEQUIPMENTTables</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - LONG-TERM DEBT - Schedule of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LONGTERMDEBTScheduleofDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Schedule of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - LONG-TERM DEBT - Schedule of Debt Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LONGTERMDEBTScheduleofDebtNarrativeDetails</Role>
      <ShortName>LONG-TERM DEBT - Schedule of Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - LONG-TERM DEBT - Schedule of Maturities of Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LONGTERMDEBTScheduleofMaturitiesofLongtermDebtDetails</Role>
      <ShortName>LONG-TERM DEBT - Schedule of Maturities of Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - INCOME TAXES - Schedule of Domestic and Foreign Components of Loss Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofDomesticandForeignComponentsofLossBeforeIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Domestic and Foreign Components of Loss Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofComponentsofIncomeTaxExpenseBenefitDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - INCOME TAXES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESNarrativeDetails</Role>
      <ShortName>INCOME TAXES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - INCOME TAXES - U.S. Federal Statutory Income Tax Rate to Income (Loss) Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESUSFederalStatutoryIncomeTaxRatetoIncomeLossBeforeIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - U.S. Federal Statutory Income Tax Rate to Income (Loss) Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - INCOME TAXES -Schedule of Effective Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofEffectiveTaxRateReconciliationDetails</Role>
      <ShortName>INCOME TAXES -Schedule of Effective Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - INCOME TAXES - Schedule of Cash Paid for Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofCashPaidforIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Cash Paid for Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - INCOME TAXES - Schedule of Deferred Income Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofDeferredIncomeTaxAssetsandLiabilitiesDetails</Role>
      <ShortName>INCOME TAXES - Schedule of Deferred Income Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - INCOME TAXES -Schedule of Unrecognized Tax Benefits Roll Forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/INCOMETAXESScheduleofUnrecognizedTaxBenefitsRollForwardDetails</Role>
      <ShortName>INCOME TAXES -Schedule of Unrecognized Tax Benefits Roll Forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - EARNINGS PER SHARE (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/EARNINGSPERSHAREDetails</Role>
      <ShortName>EARNINGS PER SHARE (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/EARNINGSPERSHARETables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - SHARE-BASED COMPENSATION AND BENEFIT PLANS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANSNarrativeDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION AND BENEFIT PLANS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - SHARE-BASED COMPENSATION AND BENEFIT PLANS - Schedule of SARs Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANSScheduleofSARsActivityDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION AND BENEFIT PLANS - Schedule of SARs Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - SHARE-BASED COMPENSATION AND BENEFIT PLANS - Schedule of Restricted Stock Unit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SHAREBASEDCOMPENSATIONANDBENEFITPLANSScheduleofRestrictedStockUnitDetails</Role>
      <ShortName>SHARE-BASED COMPENSATION AND BENEFIT PLANS - Schedule of Restricted Stock Unit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/COMMITMENTSANDCONTINGENCIESDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTSScheduleofDerivativeInstrumentsDetails</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Gain (Loss) of Derivative Instruments in Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/DERIVATIVEFINANCIALINSTRUMENTSScheduleofGainLossofDerivativeInstrumentsinStatementofOperationsDetails</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Gain (Loss) of Derivative Instruments in Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESNarrativeDetails</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of (Net Sales And Long-Lived Assets (Property, Plant, And Equipment) By Geographic Area) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESScheduleofNetSalesAndLongLivedAssetsPropertyPlantAndEquipmentByGeographicAreaDetails</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of (Net Sales And Long-Lived Assets (Property, Plant, And Equipment) By Geographic Area) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESScheduleofRevenuefromExternalCustomersAttributedtoForeignCountriesbyGeographicAreaDetails</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Percentage of Net Sales to and Trade Accounts Receivables from Significant Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESScheduleofPercentageofNetSalestoandTradeAccountsReceivablesfromSignificantCustomersDetails</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Percentage of Net Sales to and Trade Accounts Receivables from Significant Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Significant Segment Measures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/SEGMENTINFORMATIONANDENTERPRISEWIDEDISCLOSURESScheduleofSignificantSegmentMeasuresDetails</Role>
      <ShortName>SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Significant Segment Measures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - REVENUE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/REVENUENarrativeDetails</Role>
      <ShortName>REVENUE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - REVENUE - Schedule of Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/REVENUEScheduleofDisaggregationofRevenueDetails</Role>
      <ShortName>REVENUE - Schedule of Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - REVENUE - Schedule of Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/REVENUEScheduleofContractAssetsDetails</Role>
      <ShortName>REVENUE - Schedule of Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - LEASES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASESNarrativeDetails</Role>
      <ShortName>LEASES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - LEASES - Schedule of Lease Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASESScheduleofLeaseCostDetails</Role>
      <ShortName>LEASES - Schedule of Lease Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - LEASES - Schedule of Lease Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASESScheduleofLeaseAssetsandLiabilitiesDetails</Role>
      <ShortName>LEASES - Schedule of Lease Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ktcc-20260627.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - LEASES - Schedule of Operating Lease, Liability, Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.keytronic.com/role/LEASESScheduleofOperatingLeaseLiabilityMaturityDetails</Role>
      <ShortName>LEASES - Schedule of Operating Lease, Liability, Maturity (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>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="ktcc-20260627.htm">ktcc-20260627.htm</File>
    <File>ktcc-20260627.xsd</File>
    <File>ktcc-20260627_cal.xml</File>
    <File>ktcc-20260627_def.xml</File>
    <File>ktcc-20260627_lab.xml</File>
    <File>ktcc-20260627_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="739">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="15">http://xbrl.sec.gov/cyd/2026</BaseTaxonomy>
    <BaseTaxonomy items="40">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="5">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
