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Accounts Receivable Discount Programs (Details) - USD ($) | 3 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Accounts Receivable Discount Programs [Abstract] |  |
Receivables discounted | $ 111,360,000 | $ 96,854,000
Weighted average days | 345 days | 346 days
Annualized weighted average discount rate | 2.50% | 3.90%
Amount of discount recognized as interest expense | $ 2,686,000 | $ 3,649,000

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- References No definition available. + Details
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. + References No definition available. + Details
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. + References No definition available. + Details
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. + References No definition available. + Details
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. + References No definition available. + Details
Name: | mpaa_DiscountedAccountsReceivableWeightedAverageDaysForAcceleratedCollection
Namespace Prefix: | mpaa_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration