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Major Customers (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014
Sales [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	63.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember	54.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember	57.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember	52.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember
Sales [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember	19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember	21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember	21.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember
Sales [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember	6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember	11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember
Sales [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember	3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember	3.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember	4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)			36.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember		46.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerAMember
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)			20.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember		12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerBMember
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)			5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember		7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerCMember
Accounts Receivable - Trade [Member] | Customer D [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)			7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember		10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = mpaa_CustomerDMember
Significant Supplier Purchases [Member] | Supplier A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	5.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = mpaa_RawMaterialsPurchasesMember / mpaa_MajorSuppliersAxis = mpaa_SupplierAMember	13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = mpaa_RawMaterialsPurchasesMember / mpaa_MajorSuppliersAxis = mpaa_SupplierAMember	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = mpaa_RawMaterialsPurchasesMember / mpaa_MajorSuppliersAxis = mpaa_SupplierAMember	14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = mpaa_RawMaterialsPurchasesMember / mpaa_MajorSuppliersAxis = mpaa_SupplierAMember

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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