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Leases, General Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |  |  |
Gain (loss) in foreign currency-denominated lease liabilities | $ 8,638,000 | $ 2,128,000 | $ 12,241,000 | $ 1,491,000

X
- Definition Amount of gain (loss) on the remeasurement of lease liabilities. + References No definition available. + Details
Name: | mpaa_GainLossOnRemeasurementOfLeaseLiabilities
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