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Deferred Core Revenue (Details) (USD $) | 3 Months Ended
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Dec. 31, 2014
Deferred Core Revenue [Abstract] |
Deferred core revenue recognized | $ 16,331,000 us-gaap_RecognitionOfDeferredRevenue
Allowances related to core inventory purchase obligations | $ 3,706,000 mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations

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- Definition The reduction in revenue recognized during an accounting period related to core inventory purchase obligations. Allowances are a deduction from gross revenue in arriving at net revenue. + References No definition available. + Details
Name: | mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations
Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A -Subsection 1 + Details
Name: | us-gaap_RecognitionOfDeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration