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Accounts Receivable Discount Programs (Details) (USD $) | 9 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Accounts Receivable Discount Programs [Abstract] |  |
Receivables discounted | $ 229,314,000 | $ 197,019,000
Weighted average days | 316 days | 314 days
Annualized weighted average discount rate (in hundredths) | 2.80% | 2.90%
Amount of discount as interest expense | $ 5,525,000 | $ 4,984,000

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- Details
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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. + References No definition available. + Details
Name: | mpaa_AccountsReceivablesDiscounted
Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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Data Type: | num:percentItemType
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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
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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
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