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Discontinued Operations (Details) (USD $)
3 Months Ended 9 Months Ended 2 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
May 31, 2013
May 06, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Income from discontinued operations $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ 100,877,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax    
Fenco [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain from deconsolidation of Fenco         118,095,000us-gaap_DeconsolidationGainOrLossAmount
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Net sales         14,140,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Operating losses         5,910,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Income tax benefit from discontinued operations         1,374,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Loss in connection with guarantee of obligations to Fenco suppliers         20,464,000us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Income tax (benefit) from discontinued operations related to guarantee of obligations to certain Fenco suppliers         $ 9,156,000mpaa_DiscontinuedOperationTaxEffectOfDiscontinuedOperationGuarantee
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= mpaa_FencoMember
 
Fapco [Member]            
Business Acquisition [Line Items]            
Direct ownership interest acquired (in hundredths)           1.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= mpaa_FapcoMember
FAPL's ownership interest prior to acquisition (in hundredths)           99.00%mpaa_AcquireeSOwnershipInterestInSubsidiaryPriorToAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mpaa_FapcoMember
Combined direct and indirect ownership interest subsequent to acquisition (in hundredths)           100.00%mpaa_CompanySOwnershipInterestInSubsidiaryPostAcquisition
/ us-gaap_BusinessAcquisitionAxis
= mpaa_FapcoMember