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Income Taxes (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Current tax expense [Abstract]                      
Federal                 $ 1,523,000us-gaap_CurrentFederalTaxExpenseBenefit $ 4,564,000us-gaap_CurrentFederalTaxExpenseBenefit $ 31,226,000us-gaap_CurrentFederalTaxExpenseBenefit
State                 1,100,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 614,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,368,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign                 527,000us-gaap_CurrentForeignTaxExpenseBenefit 599,000us-gaap_CurrentForeignTaxExpenseBenefit 336,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current tax expense                 3,150,000us-gaap_CurrentIncomeTaxExpenseBenefit 5,777,000us-gaap_CurrentIncomeTaxExpenseBenefit 34,930,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit) [Abstract]                      
Federal                 5,553,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,477,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (25,074,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State                 93,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (162,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (2,706,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign                 272,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (759,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 282,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred tax expense (benefit)                 5,918,000mpaa_TotalDeferredTaxExpenseBenefit 1,556,000mpaa_TotalDeferredTaxExpenseBenefit (27,498,000)mpaa_TotalDeferredTaxExpenseBenefit
Total income tax expense 2,110,000us-gaap_IncomeTaxExpenseBenefit 2,826,000us-gaap_IncomeTaxExpenseBenefit 1,418,000us-gaap_IncomeTaxExpenseBenefit 2,714,000us-gaap_IncomeTaxExpenseBenefit 3,311,000us-gaap_IncomeTaxExpenseBenefit 2,317,000us-gaap_IncomeTaxExpenseBenefit 1,631,000us-gaap_IncomeTaxExpenseBenefit 74,000us-gaap_IncomeTaxExpenseBenefit 9,068,000us-gaap_IncomeTaxExpenseBenefit 7,333,000us-gaap_IncomeTaxExpenseBenefit 7,432,000us-gaap_IncomeTaxExpenseBenefit
Assets [Abstract]                      
Accounts receivable valuation 3,100,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation       3,926,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation       3,100,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation 3,926,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation  
Allowance for customer incentives 1,296,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives       1,343,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives       1,296,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives 1,343,000mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives  
Inventory obsolescence reserve 1,056,000us-gaap_DeferredTaxAssetsInventory       1,070,000us-gaap_DeferredTaxAssetsInventory       1,056,000us-gaap_DeferredTaxAssetsInventory 1,070,000us-gaap_DeferredTaxAssetsInventory  
Stock options 1,931,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       1,426,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost       1,931,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,426,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Intangibles, net 846,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets       796,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets       846,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 796,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Estimate for returns 986,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances       0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances       986,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances  
Deferred core revenue 0us-gaap_DeferredTaxAssetsDeferredIncome       2,885,000us-gaap_DeferredTaxAssetsDeferredIncome       0us-gaap_DeferredTaxAssetsDeferredIncome 2,885,000us-gaap_DeferredTaxAssetsDeferredIncome  
Accrued compensation 2,563,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities       1,787,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities       2,563,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,787,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Net operating losses 3,007,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       9,117,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards       3,007,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 9,117,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other 2,986,000us-gaap_DeferredTaxAssetsOther       2,305,000us-gaap_DeferredTaxAssetsOther       2,986,000us-gaap_DeferredTaxAssetsOther 2,305,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 17,771,000us-gaap_DeferredTaxAssetsGross       24,655,000us-gaap_DeferredTaxAssetsGross       17,771,000us-gaap_DeferredTaxAssetsGross 24,655,000us-gaap_DeferredTaxAssetsGross  
Liabilities [Abstract]                      
Property and equipment, net (807,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (298,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (807,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (298,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Estimate for returns 0mpaa_DeferredTaxLiabilitiesEstimateForReturns       (916,000)mpaa_DeferredTaxLiabilitiesEstimateForReturns       0mpaa_DeferredTaxLiabilitiesEstimateForReturns (916,000)mpaa_DeferredTaxLiabilitiesEstimateForReturns  
Other (1,635,000)us-gaap_DeferredTaxLiabilitiesOther       (2,197,000)us-gaap_DeferredTaxLiabilitiesOther       (1,635,000)us-gaap_DeferredTaxLiabilitiesOther (2,197,000)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities (2,442,000)us-gaap_DeferredIncomeTaxLiabilities       (3,411,000)us-gaap_DeferredIncomeTaxLiabilities       (2,442,000)us-gaap_DeferredIncomeTaxLiabilities (3,411,000)us-gaap_DeferredIncomeTaxLiabilities  
Less valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance       0us-gaap_DeferredTaxAssetsValuationAllowance       0us-gaap_DeferredTaxAssetsValuationAllowance 0us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets 15,329,000us-gaap_DeferredTaxAssetsLiabilitiesNet       21,244,000us-gaap_DeferredTaxAssetsLiabilitiesNet       15,329,000us-gaap_DeferredTaxAssetsLiabilitiesNet 21,244,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Net current deferred income tax asset 22,871,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       18,630,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent       22,871,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 18,630,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Net long-term deferred income tax (liability) asset (7,542,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent       2,614,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent       (7,542,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 2,614,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Current deferred income tax liabilities 127,000us-gaap_DeferredTaxLiabilitiesGrossCurrent       137,000us-gaap_DeferredTaxLiabilitiesGrossCurrent       127,000us-gaap_DeferredTaxLiabilitiesGrossCurrent 137,000us-gaap_DeferredTaxLiabilitiesGrossCurrent  
Long-term deferred income tax liabilities 7,803,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent               7,803,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent    
Federal net operating loss carryforwards 9,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic               9,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
State net operating loss carryforwards 33,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal               33,500,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
Net operating loss carryforwards expire period                 between 2020 and 2032    
Losses attributable to windfall stock option deductions                 4,900,000mpaa_LossesAttributableToWindfallStockOptionDeductions    
Net benefit to be recorded to APIC when realized                 1,900,000mpaa_NetBenefitToBeRecordedToApicWhenRealized    
Difference between income tax expense at the federal statutory rate and effective tax rate [Abstract]                      
Statutory federal income tax rate (in hundredths)                 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax rate, net of federal benefit (in hundredths)                 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Change in deferred tax rate (in hundredths)                 (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Foreign income taxed at different rates (in hundredths)                 (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (7.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Warrants (in hundredths)                 0.80%mpaa_EffectiveIncomeTaxRateReconciliationWarrantsPercent 25.70%mpaa_EffectiveIncomeTaxRateReconciliationWarrantsPercent 0.60%mpaa_EffectiveIncomeTaxRateReconciliationWarrantsPercent
Non-deductible executive compensation (in hundredths)                 3.40%mpaa_EffectiveIncomeTaxRateReconciliationIrc162MPercent 1.60%mpaa_EffectiveIncomeTaxRateReconciliationIrc162MPercent 0.70%mpaa_EffectiveIncomeTaxRateReconciliationIrc162MPercent
Uncertain Tax Positions (in hundredths)                 2.50%mpaa_EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsPercent (2.40%)mpaa_EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsPercent 0.00%mpaa_EffectiveIncomeTaxRateReconciliationUncertainTaxPositionsPercent
Other income tax (in hundredths)                 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (2.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (in hundredths)                 44.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 53.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Unrecognized tax benefits [Roll Forward]                      
Balance at beginning of period       540,000us-gaap_UnrecognizedTaxBenefits       827,000us-gaap_UnrecognizedTaxBenefits 540,000us-gaap_UnrecognizedTaxBenefits 827,000us-gaap_UnrecognizedTaxBenefits 634,000us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year                 359,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 71,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 227,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions of prior year                 336,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior year                 (118,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (358,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (34,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Settlements                 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Balance at end of period 1,117,000us-gaap_UnrecognizedTaxBenefits       540,000us-gaap_UnrecognizedTaxBenefits       1,117,000us-gaap_UnrecognizedTaxBenefits 540,000us-gaap_UnrecognizedTaxBenefits 827,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate 958,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate       387,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate       958,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 387,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 597,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Recognized interest and penalties                 (56,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (9,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 32,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Interest and penalties accrued $ 56,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued       $ 112,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued       $ 56,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 112,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued