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Company Background and Organization (Details) | 9 Months Ended
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Dec. 31, 2013 Segment Customer
Company Background and Organization [Abstract] |
Number of major existing customers to which wheel hub products were sold | 1
Number of reportable segments | 1

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- Definition The number of major existing customers to which the company has sold new wheel hub assemblies and wheel hub bearings during the period. + References No definition available. + Details
Name: | mpaa_NumberOfMajorExistingCustomersToWhichWheelHubProductsWereSold
Namespace Prefix: | mpaa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration