Leases, General Information (Details) - USD ($)	3 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Gain (loss) in foreign currency-denominated lease liabilities	$ 2,795,000	$ 1,985,000

Amount of gain (loss) on the remeasurement of lease liabilities.

No definition available.

Name:	mpaa_GainLossOnRemeasurementOfLeaseLiabilities
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration