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Accounts Receivable - Net (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Accounts Receivable - Net [Abstract]          
Accounts receivable - trade $ 46,018,000us-gaap_AccountsReceivableGrossCurrent   $ 46,018,000us-gaap_AccountsReceivableGrossCurrent   $ 58,766,000us-gaap_AccountsReceivableGrossCurrent
Allowance for bad debts (623,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   (623,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   (854,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Customer allowances earned (12,153,000)mpaa_CustomerAllowancesEarned   (12,153,000)mpaa_CustomerAllowancesEarned   (9,088,000)mpaa_CustomerAllowancesEarned
Customer payment discrepancies (487,000)mpaa_CustomerPaymentDiscrepancies   (487,000)mpaa_CustomerPaymentDiscrepancies   (577,000)mpaa_CustomerPaymentDiscrepancies
Customer returns RGA issued (9,018,000)mpaa_CustomerReturnsRgaIssued   (9,018,000)mpaa_CustomerReturnsRgaIssued   (5,809,000)mpaa_CustomerReturnsRgaIssued
Customer core returns accruals (24,638,000)mpaa_CustomerCoreReturnsAccrualsCurrent   (24,638,000)mpaa_CustomerCoreReturnsAccrualsCurrent   (20,155,000)mpaa_CustomerCoreReturnsAccrualsCurrent
Less: total accounts receivable offset accounts (46,919,000)mpaa_TotalAccountsReceivableOffsetAccounts   (46,919,000)mpaa_TotalAccountsReceivableOffsetAccounts   (36,483,000)mpaa_TotalAccountsReceivableOffsetAccounts
Total accounts receivable - net (901,000)us-gaap_AccountsReceivableNet [1]   (901,000)us-gaap_AccountsReceivableNet [1]   22,283,000us-gaap_AccountsReceivableNet
Warranty Returns [Abstract]          
Warranty accrual included in customer returns RGA issued 3,355,000mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued   3,355,000mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued   2,407,000mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued
Warranty accrual included in customer finished goods returns accrual 3,648,000mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual   3,648,000mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual   5,632,000mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual
Change in warranty return accrual [Roll Forward]          
Balance at beginning of period 8,421,000us-gaap_StandardProductWarrantyAccrual 7,204,000us-gaap_StandardProductWarrantyAccrual 8,039,000us-gaap_StandardProductWarrantyAccrual 6,205,000us-gaap_StandardProductWarrantyAccrual  
Charged to expense 13,651,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 12,471,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 44,010,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 41,196,000us-gaap_StandardProductWarrantyAccrualWarrantiesIssued  
Amounts processed (15,069,000)us-gaap_StandardProductWarrantyAccrualPayments (13,267,000)us-gaap_StandardProductWarrantyAccrualPayments (45,046,000)us-gaap_StandardProductWarrantyAccrualPayments (40,993,000)us-gaap_StandardProductWarrantyAccrualPayments  
Balance at end of period $ 7,003,000us-gaap_StandardProductWarrantyAccrual $ 6,408,000us-gaap_StandardProductWarrantyAccrual $ 7,003,000us-gaap_StandardProductWarrantyAccrual $ 6,408,000us-gaap_StandardProductWarrantyAccrual  
[1] Accounts receivable -net has been reclassified and included in accrued liabilities in the consolidated balance sheet at December 31, 2014 (see Note 3).