<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>171</ContextCount>
  <ElementCount>372</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>54</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>001 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConsolidatedBalanceSheet</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>002 - Statement - Condensed Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConsolidatedBalanceSheet_Parentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConsolidatedIncomeStatement</Role>
      <ShortName>Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>004 - Statement - Condensed Consolidated Statements of Comprehensive (Loss) Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConsolidatedComprehensiveIncome</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive (Loss) Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Consolidated Statements of Shareholders’ Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ShareholdersEquityType2or3</Role>
      <ShortName>Condensed Consolidated Statements of Shareholders’ Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConsolidatedCashFlow</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>007 - Disclosure - Company Background and Organization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/CompanyBackgroundandOrganization</Role>
      <ShortName>Company Background and Organization</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>008 - Disclosure - Basis of Presentation and New Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/BasisofPresentationandNewAccountingPronouncements</Role>
      <ShortName>Basis of Presentation and New Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>009 - Disclosure - Accounts Receivable - Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableNet</Role>
      <ShortName>Accounts Receivable - Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>010 - Disclosure - Inventory - Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/InventoryNet</Role>
      <ShortName>Inventory - Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>011 - Disclosure - Contract Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractAssets</Role>
      <ShortName>Contract Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>012 - Disclosure - Significant Customer and Other Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SignificantCustomerandOtherInformation</Role>
      <ShortName>Significant Customer and Other Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>013 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>014 - Disclosure - Contract Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractLiabilities</Role>
      <ShortName>Contract Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>015 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>016 - Disclosure - Accounts Receivable Discount Programs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableDiscountPrograms</Role>
      <ShortName>Accounts Receivable Discount Programs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>017 - Disclosure - Supplier Finance Programs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SupplierFinancePrograms</Role>
      <ShortName>Supplier Finance Programs</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>018 - Disclosure - Net (Loss) Income per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/NetLossIncomeperShare</Role>
      <ShortName>Net (Loss) Income per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>019 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020 - Disclosure - Financial Risk Management and Derivatives</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FinancialRiskManagementandDerivatives</Role>
      <ShortName>Financial Risk Management and Derivatives</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>021 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>022 - Disclosure - Share-based Payments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SharebasedPayments</Role>
      <ShortName>Share-based Payments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>023 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/CommitmentsandContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>024 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>025 - Disclosure - Share Repurchases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ShareRepurchases</Role>
      <ShortName>Share Repurchases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>026 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.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>28</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>996000 - Disclosure - Accounting Policies, by Policy (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountingPoliciesByPolicy</Role>
      <ShortName>Accounting Policies, by Policy (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/BasisofPresentationandNewAccountingPronouncements</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>996001 - Disclosure - Accounts Receivable - Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableNetTables</Role>
      <ShortName>Accounts Receivable - Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/AccountsReceivableNet</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>996002 - Disclosure - Inventory - Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/InventoryNetTables</Role>
      <ShortName>Inventory - Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/InventoryNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>996003 - Disclosure - Contract Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractAssetsTables</Role>
      <ShortName>Contract Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/ContractAssets</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>996004 - Disclosure - Significant Customer and Other Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SignificantCustomerandOtherInformationTables</Role>
      <ShortName>Significant Customer and Other Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/SignificantCustomerandOtherInformation</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>996005 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/Debt</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>996006 - Disclosure - Contract Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractLiabilitiesTables</Role>
      <ShortName>Contract Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/ContractLiabilities</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>996007 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/Leases</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>996008 - Disclosure - Accounts Receivable Discount Programs (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableDiscountProgramsTables</Role>
      <ShortName>Accounts Receivable Discount Programs (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/AccountsReceivableDiscountPrograms</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>996009 - Disclosure - Net (Loss) Income per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/NetLossIncomeperShareTables</Role>
      <ShortName>Net (Loss) Income per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/NetLossIncomeperShare</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>996010 - Disclosure - Financial Risk Management and Derivatives (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FinancialRiskManagementandDerivativesTables</Role>
      <ShortName>Financial Risk Management and Derivatives (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/FinancialRiskManagementandDerivatives</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>996011 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/FairValueMeasurements</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>996012 - Disclosure - Share-based Payments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SharebasedPaymentsTables</Role>
      <ShortName>Share-based Payments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/SharebasedPayments</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>996013 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/CommitmentsandContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/CommitmentsandContingencies</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>996014 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/SegmentInformation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>996015 - Disclosure - Accounts Receivable - Net - Accounts Receivable - Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableNetTable</Role>
      <ShortName>Accounts Receivable - Net - Accounts Receivable - Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>996016 - Disclosure - Inventory - Net - Inventory - Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/InventoryNetTable</Role>
      <ShortName>Inventory - Net - Inventory - Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>996017 - Disclosure - Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractAssetsDetails</Role>
      <ShortName>Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/ContractAssetsTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>996018 - Disclosure - Contract Assets - Contract Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractAssetsTable</Role>
      <ShortName>Contract Assets - Contract Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>996019 - Disclosure - Significant Customer and Other Information - Concentrations of Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConcentrationsofRiskTable</Role>
      <ShortName>Significant Customer and Other Information - Concentrations of Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>996020 - Disclosure - Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/DebtDetails</Role>
      <ShortName>Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/DebtTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>996021 - Disclosure - Debt - Convertible Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ConvertibleDebtTable</Role>
      <ShortName>Debt - Convertible Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>996022 - Disclosure - Debt - Total Interest Expense Recognized Related to Convertible Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://motorcarparts.com/role/TotalInterestExpenseRecognizedRelatedtoConvertibleNotesTable</Role>
      <ShortName>Debt - Total Interest Expense Recognized Related to Convertible Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>996023 - Disclosure - Contract Liabilities - Contract Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ContractLiabilitiesTable</Role>
      <ShortName>Contract Liabilities - Contract Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>996024 - Disclosure - Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/LeasesDetails</Role>
      <ShortName>Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/LeasesTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>996025 - Disclosure - Leases - Balance Sheet Information for Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/BalanceSheetInformationforLeasesTable</Role>
      <ShortName>Leases - Balance Sheet Information for Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>996026 - Disclosure - Leases - Lease Cost Recognized in Consolidated Statement of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/LeaseCostRecognizedinConsolidatedStatementofOperationsTable</Role>
      <ShortName>Leases - Lease Cost Recognized in Consolidated Statement of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>996027 - Disclosure - Leases - Maturity of Lease Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/MaturityofLeaseCommitmentsTable</Role>
      <ShortName>Leases - Maturity of Lease Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>996028 - Disclosure - Leases - Other Information about Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/OtherInformationaboutLeasesTable</Role>
      <ShortName>Leases - Other Information about Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>996029 - Disclosure - Accounts Receivable Discount Programs - Accounts Receivable Discount Programs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/AccountsReceivableDiscountProgramsTable</Role>
      <ShortName>Accounts Receivable Discount Programs - Accounts Receivable Discount Programs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>996030 - Disclosure - Supplier Finance Programs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SupplierFinanceProgramsDetails</Role>
      <ShortName>Supplier Finance Programs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/SupplierFinancePrograms</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>996031 - Disclosure - Net (Loss) Income per Share - Reconciliation of Basic and Diluted Net (Loss) Income Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ReconciliationofBasicandDilutedNetLossIncomePerShareTable</Role>
      <ShortName>Net (Loss) Income per Share - Reconciliation of Basic and Diluted Net (Loss) Income Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/NetLossIncomeperShareTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>996032 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/IncomeTaxes</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>996033 - Disclosure - Financial Risk Management and Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FinancialRiskManagementandDerivativesDetails</Role>
      <ShortName>Financial Risk Management and Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/FinancialRiskManagementandDerivativesTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>996034 - Disclosure - Financial Risk Management and Derivatives - Derivative Instruments on Consolidated Statements of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/DerivativeInstrumentsonConsolidatedStatementsofOperationsTable</Role>
      <ShortName>Financial Risk Management and Derivatives - Derivative Instruments on Consolidated Statements of Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>996035 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/FairValueMeasurementsTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>996036 - Disclosure - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FinancialAssetsandLiabilitiesMeasuredatFairValueRecurringBasisTable</Role>
      <ShortName>Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>996037 - Disclosure - Fair Value Measurements - Fair Value Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FairValueAssumptionsTable</Role>
      <ShortName>Fair Value Measurements - Fair Value Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>996038 - Disclosure - Share-based Payments - Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SharebasedPaymentsDetailsStockOptions</Role>
      <ShortName>Share-based Payments - Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>996039 - Disclosure - Share-based Payments - Stock Option Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/StockOptionTransactionsTable</Role>
      <ShortName>Share-based Payments - Stock Option Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>996040 - Disclosure - Share-based Payments - Restricted Stock Units (“RSUs”) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SharebasedPaymentsDetailsRestrictedStockUnitsRSUs</Role>
      <ShortName>Share-based Payments - Restricted Stock Units (“RSUs”) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>996041 - Disclosure - Share-based Payments - Restricted Stock Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/RestrictedStockUnitsTable</Role>
      <ShortName>Share-based Payments - Restricted Stock Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>996042 - Disclosure - Share-based Payments - Performance Stock Units (“PSUs”) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SharebasedPaymentsDetailsPerformanceStockUnitsPSUs</Role>
      <ShortName>Share-based Payments - Performance Stock Units (“PSUs”) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>996043 - Disclosure - Share-based Payments - Monte Carlo Valuation Model Assumptions Used in Determining Fair Value of TSR Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/MonteCarloValuationModelAssumptionsUsedinDeterminingFairValueofTSRAwardsTable</Role>
      <ShortName>Share-based Payments - Monte Carlo Valuation Model Assumptions Used in Determining Fair Value of TSR Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>996044 - Disclosure - Share-based Payments - Performance Stock Units Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/PerformanceStockUnitsActivityTable</Role>
      <ShortName>Share-based Payments - Performance Stock Units Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>996045 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/CommitmentsandContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/CommitmentsandContingenciesTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>996046 - Disclosure - Commitments and Contingencies - Changes in Warranty Returns (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ChangesinWarrantyReturnsTable</Role>
      <ShortName>Commitments and Contingencies - Changes in Warranty Returns (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>996047 - Disclosure - Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/SegmentInformationDetails</Role>
      <ShortName>Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/SegmentInformationTables</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>996048 - Disclosure - Segment Information - Financial Information Relating to Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/FinancialInformationRelatingtoSegmentsTable</Role>
      <ShortName>Segment Information - Financial Information Relating to Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>996049 - Disclosure - Share Repurchases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/ShareRepurchasesDetails</Role>
      <ShortName>Share Repurchases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/ShareRepurchases</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="ef20076089_10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>996050 - Disclosure - Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://motorcarparts.com/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://motorcarparts.com/role/RelatedPartyTransactions</ParentRole>
      <Position>79</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="ef20076089_10q.htm">ef20076089_10q.htm</File>
    <File>mpaa-20260630.xsd</File>
    <File>mpaa-20260630_cal.xml</File>
    <File>mpaa-20260630_def.xml</File>
    <File>mpaa-20260630_lab.xml</File>
    <File>mpaa-20260630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2">http://fasb.org/srt/2026</BaseTaxonomy>
    <BaseTaxonomy items="687">http://fasb.org/us-gaap/2026</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
