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Leases, General Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Leases [Abstract] |  |  |  |
Gain (loss) in foreign currency-denominated lease liabilities | $ (1,746,000) | $ 1,618,000 | $ 1,049,000 | $ 3,603,000

X
- Definition Amount of gain (loss) on the remeasurement of lease liabilities. + 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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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration