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Accounts Receivable Discount Programs - Accounts Receivable Discount Programs (Details) - USD ($)	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accounts Receivable Discount Programs [Abstract]
Receivables discounted	$ 339,254,000	$ 303,638,000
Weighted average number of days collection was accelerated	345 days	343 days
Annualized weighted average discount rate	5.60%	6.50%
Amount of discount recognized as interest expense	$ 18,098,000	$ 18,870,000

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No definition available.

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Name:	mpaa_AccountsReceivableDiscountProgramsAbstract
Namespace Prefix:	mpaa_
Data Type:	xbrli:stringItemType
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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:	dtr: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

Weighted average number of days these discount arrangements have allowed the Company to accelerate collection of discounted accounts receivable balances during the period measured in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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