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Net Income Per Share (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Net Income Per Share [Abstract] |  |  |  |
Income from continuing operations | $ 2,927,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 1,148,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 8,351,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 3,415,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income | $ 2,927,000 us-gaap_NetIncomeLoss | $ 1,148,000 us-gaap_NetIncomeLoss | $ 8,351,000 us-gaap_NetIncomeLoss | $ 104,292,000 us-gaap_NetIncomeLoss
Basic shares (in shares) | 17,921,682 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,618,930 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 16,331,168 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,513,864 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of potentially dilutive securities (in shares) | 900,982 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 810,826 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 874,901 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 431,073 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted shares (in shares) | 18,822,664 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,429,756 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 17,206,069 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,944,937 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share [Abstract] |  |  |  |
Basic net income per share from continuing operations (in dollars per share) | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.08 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.24 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic net income per share from discontinued operations (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 6.95 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Basic net income per share (in dollars per share) | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 7.19 us-gaap_EarningsPerShareBasic
Diluted net income per share from continuing operations (in dollars per share) | $ 0.16 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.07 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.23 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted net income per share from discontinued operations (in dollars per share) | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 6.75 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 6.98 us-gaap_EarningsPerShareDiluted
Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive shares excluded from computation of earnings per share (in shares) |  |  |  | 421,500 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember
Options [Member] | Minimum [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Exercise price of antidilutive options and warrants (in dollars per share) |  |  |  | $ 10.73 mpaa_ExercisePriceOfAntidilutiveOptionsAndWarrants / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Options [Member] | Maximum [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Exercise price of antidilutive options and warrants (in dollars per share) |  |  |  | $ 15.06 mpaa_ExercisePriceOfAntidilutiveOptionsAndWarrants / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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