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Summary of Significant Accounting Policies (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
Inventory [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior period over which allocations of labor and variable and fixed overhead costs are determined based on average actual use of production facilities |  |  |  |  |  |  |  |  | 12 months |  |
Unallocated overhead costs excluded from calculation of finished goods cost |  |  |  |  |  |  |  |  | $ 0 mpaa_UnallocatedOverheadCostsExcludedFromCalculationOfFinishedGoodsCost | $ 1,070,000 mpaa_UnallocatedOverheadCostsExcludedFromCalculationOfFinishedGoodsCost | $ 1,561,000 mpaa_UnallocatedOverheadCostsExcludedFromCalculationOfFinishedGoodsCost
Percentage of inventory reserve to cost if no liquidation market exists for part (in hundredths) | 100.00%mpaa_PercentageOfInventoryReserveToCostIfNoLiquidationMarketExistsForPart |  |  |  |  |  |  |  | 100.00%mpaa_PercentageOfInventoryReserveToCostIfNoLiquidationMarketExistsForPart |  |
Reserve for excess and obsolete inventory | 2,675,000 us-gaap_InventoryValuationReserves |  |  |  | 2,708,000 us-gaap_InventoryValuationReserves |  |  |  | 2,675,000 us-gaap_InventoryValuationReserves | 2,708,000 us-gaap_InventoryValuationReserves |
Period of normal operating cycle |  |  |  |  |  |  |  |  | 1 year |  |
Deferred Core Revenue [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred core revenue recognized |  |  |  |  |  |  |  |  | 16,331,000 us-gaap_RecognitionOfDeferredRevenue |  |
Accrued sales allowance |  |  |  |  |  |  |  |  | 3,706,000 us-gaap_SalesReturnsAndAllowancesGoods |  |
Advertising Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Advertising expenses |  |  |  |  |  |  |  |  | 224,000 us-gaap_AdvertisingExpense | 205,000 us-gaap_AdvertisingExpense | 343,000 us-gaap_AdvertisingExpense
Reconciliation of basic and diluted net income (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  | 3,067,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 1,148,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 2,164,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 103,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 11,453,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 6,482,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 14,558,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income (loss) from discontinued operations |  |  |  |  | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (106,069,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income (loss) | 3,102,000 us-gaap_NetIncomeLoss | 2,927,000 us-gaap_NetIncomeLoss | 1,475,000 us-gaap_NetIncomeLoss | 3,949,000 us-gaap_NetIncomeLoss | 3,067,000 us-gaap_NetIncomeLoss | 1,148,000 us-gaap_NetIncomeLoss | 2,164,000 us-gaap_NetIncomeLoss | 100,980,000 us-gaap_NetIncomeLoss | 11,453,000 us-gaap_NetIncomeLoss | 107,359,000 us-gaap_NetIncomeLoss | (91,511,000)us-gaap_NetIncomeLoss
Basic shares (in shares) |  |  |  |  |  |  |  |  | 16,734,539 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,633,946 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,327,310 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options and warrants (in shares) |  |  |  |  |  |  |  |  | 871,401 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 683,985 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 58,205 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted shares (in shares) |  |  |  |  |  |  |  |  | 17,605,940 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,317,931 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,385,515 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic net income per share from continuing operations (in dollars per share) |  |  |  |  | $ 0.20 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.68 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.45 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.01 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic net income (loss) per share from discontinued operations (in dollars per share) |  |  |  |  | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 6.97 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 6.89 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (7.40)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic net income (loss) per share (in dollars per share) | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 6.98 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ 7.34 us-gaap_EarningsPerShareBasic | $ (6.39)us-gaap_EarningsPerShareBasic
Diluted net income per share from continuing operations (in dollars per share) |  |  |  |  | $ 0.19 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.07 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.65 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.42 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.01 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted net income (loss) per share from discontinued operation (in dollars per share) |  |  |  |  | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 6.90 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 6.59 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (7.37)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Diluted net income (loss) per share (in dollars per share) | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.15 us-gaap_EarningsPerShareDiluted | $ 6.91 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 7.01 us-gaap_EarningsPerShareDiluted | $ (6.36)us-gaap_EarningsPerShareDiluted
Black-Scholes option pricing model assumptions used to derive the weighted average fair value of the stock options granted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average risk free interest rate (in hundredths) |  |  |  |  |  |  |  |  | 1.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | 1.88%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate | 1.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Weighted average expected holding period |  |  |  |  |  |  |  |  | 5 years 0 months 4 days | 5 years 10 months 20 days | 6 years 7 months 6 days
Weighted average expected volatility (in hundredths) |  |  |  |  |  |  |  |  | 46.02%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | 48.15%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate | 44.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Weighted average expected dividend yield (in hundredths) |  |  |  |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Weighted average fair value of options granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 9.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.16 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 2.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Deferred Compensation Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |
Short-term investments redeemed for the payment of deferred compensation liabilities |  |  |  |  |  |  |  |  | 4,000 mpaa_ShortTermInvestmentsRedeemed | 0 mpaa_ShortTermInvestmentsRedeemed |
Carrying value of plan assets | 699,000 us-gaap_DeferredCompensationPlanAssets |  |  |  | 521,000 us-gaap_DeferredCompensationPlanAssets |  |  |  | 699,000 us-gaap_DeferredCompensationPlanAssets | 521,000 us-gaap_DeferredCompensationPlanAssets |
Deferred compensation obligation | 699,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |  |  |  | 521,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |  |  |  | 699,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability | 521,000 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |
Expense related to the deferred compensation plan |  |  |  |  |  |  |  |  | $ 17,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 10,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 8,000 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from effect of dilutive options and warrants (in shares) |  |  |  |  |  |  |  |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 77,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 1,922,334 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from effect of dilutive options and warrants (in shares) |  |  |  |  |  |  |  |  |  |  | 735,484 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 13.65 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  | $ 13.65 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 5.83 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 19.94 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  | $ 19.94 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 15.06 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 5 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 10 years |  |
Office Equipment and Fixtures [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 3 years |  |
Office Equipment and Fixtures [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated service life |  |  |  |  |  |  |  |  | 10 years |  |

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