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Discontinued Operations and Deconsolidation of Fenco (Details) (USD $) | 3 Months Ended | 12 Months Ended | 2 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | May 31, 2013 | May 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (106,069,000)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 |
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 |
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 |
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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- Definition The acquired company's ownership interest in one of its subsidiaries prior to acquisition by the company. + References No definition available. + Details
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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684 + Details
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