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Leases, General Information (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Gain in foreign currency-denominated lease liabilities	$ 1,985,000	$ 502,000

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

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration