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Short-Term Investments (Details) (USD $) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Short-Term Investments [Abstract] |  |
Short-term investments redeemed for the payment of deferred compensation liabilities | $ 4,000 mpaa_ShortTermInvestmentsRedeemed | $ 0 mpaa_ShortTermInvestmentsRedeemed
Short-term investments | 699,000 us-gaap_ShortTermInvestments | 521,000 us-gaap_ShortTermInvestments
Liability to plan participants | $ 699,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability | $ 521,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability

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- Definition Amount of short-term investments redeemed during the reporting period. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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