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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 | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |
Fenco [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain from deconsolidation of Fenco |  |  |  |  | 118,095,000 us-gaap_DeconsolidationGainOrLossAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mpaa_FencoMember |
Net sales |  |  |  |  | 14,140,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mpaa_FencoMember |
Operating losses |  |  |  |  | 5,910,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mpaa_FencoMember |
Income tax benefit from discontinued operations |  |  |  |  | 1,374,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mpaa_FencoMember |
Loss in connection with guarantee of obligations to Fenco suppliers |  |  |  |  | 20,464,000 us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationsBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mpaa_FencoMember |
Income tax (benefit) from discontinued operations related to guarantee of obligations to certain Fenco suppliers |  |  |  |  | $ 9,156,000 mpaa_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

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