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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 |  |  |  |  |  |  |  |  | $ 1,523,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 4,564,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ 31,226,000 us-gaap_CurrentFederalTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 1,100,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 614,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 3,368,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 527,000 us-gaap_CurrentForeignTaxExpenseBenefit | 599,000 us-gaap_CurrentForeignTaxExpenseBenefit | 336,000 us-gaap_CurrentForeignTaxExpenseBenefit
Total current tax expense |  |  |  |  |  |  |  |  | 3,150,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 5,777,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 34,930,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax expense (benefit) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 5,553,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,477,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (25,074,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State |  |  |  |  |  |  |  |  | 93,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (162,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (2,706,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign |  |  |  |  |  |  |  |  | 272,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (759,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 282,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred tax expense (benefit) |  |  |  |  |  |  |  |  | 5,918,000 mpaa_TotalDeferredTaxExpenseBenefit | 1,556,000 mpaa_TotalDeferredTaxExpenseBenefit | (27,498,000)mpaa_TotalDeferredTaxExpenseBenefit
Total income tax expense | 2,110,000 us-gaap_IncomeTaxExpenseBenefit | 2,826,000 us-gaap_IncomeTaxExpenseBenefit | 1,418,000 us-gaap_IncomeTaxExpenseBenefit | 2,714,000 us-gaap_IncomeTaxExpenseBenefit | 3,311,000 us-gaap_IncomeTaxExpenseBenefit | 2,317,000 us-gaap_IncomeTaxExpenseBenefit | 1,631,000 us-gaap_IncomeTaxExpenseBenefit | 74,000 us-gaap_IncomeTaxExpenseBenefit | 9,068,000 us-gaap_IncomeTaxExpenseBenefit | 7,333,000 us-gaap_IncomeTaxExpenseBenefit | 7,432,000 us-gaap_IncomeTaxExpenseBenefit
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable valuation | 3,100,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation |  |  |  | 3,926,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation |  |  |  | 3,100,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation | 3,926,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccountsReceivableValuation |
Allowance for customer incentives | 1,296,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives |  |  |  | 1,343,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives |  |  |  | 1,296,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives | 1,343,000 mpaa_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForCustomerIncentives |
Inventory obsolescence reserve | 1,056,000 us-gaap_DeferredTaxAssetsInventory |  |  |  | 1,070,000 us-gaap_DeferredTaxAssetsInventory |  |  |  | 1,056,000 us-gaap_DeferredTaxAssetsInventory | 1,070,000 us-gaap_DeferredTaxAssetsInventory |
Stock options | 1,931,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |  |  |  | 1,426,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |  |  |  | 1,931,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,426,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Intangibles, net | 846,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |  |  |  | 796,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |  |  |  | 846,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 796,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Estimate for returns | 986,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances |  |  |  | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances |  |  |  | 986,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances | 0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances |
Deferred core revenue | 0 us-gaap_DeferredTaxAssetsDeferredIncome |  |  |  | 2,885,000 us-gaap_DeferredTaxAssetsDeferredIncome |  |  |  | 0 us-gaap_DeferredTaxAssetsDeferredIncome | 2,885,000 us-gaap_DeferredTaxAssetsDeferredIncome |
Accrued compensation | 2,563,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  |  |  | 1,787,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |  |  |  | 2,563,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 1,787,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |
Net operating losses | 3,007,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  | 9,117,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  | 3,007,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 9,117,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Other | 2,986,000 us-gaap_DeferredTaxAssetsOther |  |  |  | 2,305,000 us-gaap_DeferredTaxAssetsOther |  |  |  | 2,986,000 us-gaap_DeferredTaxAssetsOther | 2,305,000 us-gaap_DeferredTaxAssetsOther |
Total deferred tax assets | 17,771,000 us-gaap_DeferredTaxAssetsGross |  |  |  | 24,655,000 us-gaap_DeferredTaxAssetsGross |  |  |  | 17,771,000 us-gaap_DeferredTaxAssetsGross | 24,655,000 us-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 | 0 mpaa_DeferredTaxLiabilitiesEstimateForReturns |  |  |  | (916,000)mpaa_DeferredTaxLiabilitiesEstimateForReturns |  |  |  | 0 mpaa_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 | 0 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 0 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred tax assets | 15,329,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |  | 21,244,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |  | 15,329,000 us-gaap_DeferredTaxAssetsLiabilitiesNet | 21,244,000 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Net current deferred income tax asset | 22,871,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |  |  |  | 18,630,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |  |  |  | 22,871,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 18,630,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |
Net long-term deferred income tax (liability) asset | (7,542,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |  |  |  | 2,614,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |  |  |  | (7,542,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | 2,614,000 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |
Current deferred income tax liabilities | 127,000 us-gaap_DeferredTaxLiabilitiesGrossCurrent |  |  |  | 137,000 us-gaap_DeferredTaxLiabilitiesGrossCurrent |  |  |  | 127,000 us-gaap_DeferredTaxLiabilitiesGrossCurrent | 137,000 us-gaap_DeferredTaxLiabilitiesGrossCurrent |
Long-term deferred income tax liabilities | 7,803,000 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  |  |  |  |  |  |  | 7,803,000 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent |  |
Federal net operating loss carryforwards | 9,800,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |  |  |  |  |  |  | 9,800,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |
State net operating loss carryforwards | 33,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |  |  |  |  |  |  | 33,500,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |
Net operating loss carryforwards expire period |  |  |  |  |  |  |  |  | between 2020 and 2032 |  |
Losses attributable to windfall stock option deductions |  |  |  |  |  |  |  |  | 4,900,000 mpaa_LossesAttributableToWindfallStockOptionDeductions |  |
Net benefit to be recorded to APIC when realized |  |  |  |  |  |  |  |  | 1,900,000 mpaa_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 |  |  |  | 540,000 us-gaap_UnrecognizedTaxBenefits |  |  |  | 827,000 us-gaap_UnrecognizedTaxBenefits | 540,000 us-gaap_UnrecognizedTaxBenefits | 827,000 us-gaap_UnrecognizedTaxBenefits | 634,000 us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year |  |  |  |  |  |  |  |  | 359,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 71,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 227,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions of prior year |  |  |  |  |  |  |  |  | 336,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0 us-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 |  |  |  |  |  |  |  |  | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Balance at end of period | 1,117,000 us-gaap_UnrecognizedTaxBenefits |  |  |  | 540,000 us-gaap_UnrecognizedTaxBenefits |  |  |  | 1,117,000 us-gaap_UnrecognizedTaxBenefits | 540,000 us-gaap_UnrecognizedTaxBenefits | 827,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate | 958,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  | 387,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |  | 958,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 387,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 597,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Recognized interest and penalties |  |  |  |  |  |  |  |  | (56,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | (9,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 32,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Interest and penalties accrued | $ 56,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  | $ 112,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  | $ 56,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | $ 112,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the impact of the non-deductible executive compensation under Internal Revenue Code Section 162(m). + References No definition available. + Details
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