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Litigation (Details) - Fapco [Member] | May. 31, 2011
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Business Acquisition [Line Items] |
Direct ownership interest acquired (in hundredths) | 1.00%
FAPL's ownership interest prior to acquisition (in hundredths) | 99.00%
Combined direct and indirect ownership interest subsequent to acquisition (in hundredths) | 100.00%

X
- Definition The acquired company's ownership interest in one of its subsidiaries prior to acquisition by the company. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The company's ownership interest in the acquired subsidiary subsequent to acquisition. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
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X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |