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

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