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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Remaining future minimum rental payments under operating leases [Abstract] |  |  |
2016 | $ 3,141,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |
2017 | 3,004,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |
2018 | 1,310,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |
2019 | 1,129,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |
2020 | 1,101,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |
Thereafter | 2,293,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter |  |
Total minimum lease payments | 11,978,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |
Total operating lease expenses | 3,030,000 us-gaap_LeaseAndRentalExpense | 2,928,000 us-gaap_LeaseAndRentalExpense | 2,567,000 us-gaap_LeaseAndRentalExpense
Commitments to Provide Marketing Allowances under Long-Term Customer Contracts [Abstract] |  |  |
Term of long-term agreements with major customer | 4 years |  |
Breakout of allowances recorded as reduction to revenues [Abstract] |  |  |
Allowances incurred under long-term customer contracts | 18,358,000 mpaa_AllowancesIncurredUnderLongTermCustomerContracts | 16,099,000 mpaa_AllowancesIncurredUnderLongTermCustomerContracts | 13,590,000 mpaa_AllowancesIncurredUnderLongTermCustomerContracts
Allowances related to a single exchange of product | 36,112,000 mpaa_AllowancesRelatedToSingleExchangeOfProduct | 30,948,000 mpaa_AllowancesRelatedToSingleExchangeOfProduct | 27,392,000 mpaa_AllowancesRelatedToSingleExchangeOfProduct
Allowances related to core inventory purchase obligations | 15,540,000 mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations | 2,506,000 mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations | 2,615,000 mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations
Total customer allowances recorded as a reduction of revenues | 70,010,000 mpaa_TotalCustomerAllowancesRecordedAsReductionOfRevenue | 49,553,000 mpaa_TotalCustomerAllowancesRecordedAsReductionOfRevenue | 43,597,000 mpaa_TotalCustomerAllowancesRecordedAsReductionOfRevenue
Marketing allowances and customer Remanufactured Core purchase obligation [Abstract] |  |  |
2016 | 22,518,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInNextTwelveMonths |  |
2017 | 18,988,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInSecondYear |  |
2018 | 10,547,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInThirdYear |  |
2019 | 4,585,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInFourthYear |  |
2020 | 2,458,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInFifthYear |  |
Thereafter | 3,982,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueAfterFifthYear |  |
Total marketing allowances | 63,078,000 mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligations |  |
Workers Compensation Insurance [Abstract] |  |  |
Period over which Company purchased workers compensation insurance on large deductible plan | 5 years |  |
Amount of each workers compensation claim for which Company is liable | $ 250,000 mpaa_AmountOfEachWorkersCompensationClaimForWhichCompanyIsLiable |  |

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- Definition Future minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement as of the balance sheet date. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the third fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition The period prior to January 1, 2007, over which the Company purchased workers compensation insurance on a large deductible plan. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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