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Accounts Receivable Discount Programs (Details) - USD ($)	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Accounts Receivable Discount Programs [Abstract]
Receivables discounted	$ 205,882,000	$ 191,849,000
Weighted average days	346 days	338 days
Annualized weighted average discount rate	3.60%	4.10%
Amount of discount recognized as interest expense	$ 7,196,000	$ 7,441,000

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No definition available.

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Name:	mpaa_AccountsReceivableDiscountProgramsAbstract
Namespace Prefix:	mpaa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount of customers' receivable balances that have been sold to the customers' respective banks at a discount during the period.

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No definition available.

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Name:	mpaa_AccountsReceivablesDiscounted
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represents the weighted average discount rate, on an annualized basis, on the accounts receivable balances sold during the period.

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No definition available.

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Name:	mpaa_AnnualizedWeightedAverageDiscountRateOnDiscountedAccountsReceivables
Namespace Prefix:	mpaa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount of the discount on accounts receivable balances sold that was recorded as interest expense during the period.

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No definition available.

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Name:	mpaa_DiscountRecordedAsInterestExpense
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Represents the weighted average number of days these discount arrangements have allowed the Company to accelerate collection of discounted accounts receivable balances during the period.

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No definition available.

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Name:	mpaa_DiscountedAccountsReceivableWeightedAverageDaysForAcceleratedCollection
Namespace Prefix:	mpaa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration