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Unaudited Quarterly Financial Data (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
Unaudited Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 83,904,000 us-gaap_SalesRevenueNet | $ 83,992,000 us-gaap_SalesRevenueNet | $ 70,840,000 us-gaap_SalesRevenueNet | $ 62,975,000 us-gaap_SalesRevenueNet | $ 76,682,000 us-gaap_SalesRevenueNet | $ 65,568,000 us-gaap_SalesRevenueNet | $ 66,174,000 us-gaap_SalesRevenueNet | $ 50,245,000 us-gaap_SalesRevenueNet | $ 301,711,000 us-gaap_SalesRevenueNet | $ 258,669,000 us-gaap_SalesRevenueNet | $ 213,151,000 us-gaap_SalesRevenueNet
Cost of goods sold | 62,995,000 us-gaap_CostOfGoodsAndServicesSold | 59,564,000 us-gaap_CostOfGoodsAndServicesSold | 52,420,000 us-gaap_CostOfGoodsAndServicesSold | 45,159,000 us-gaap_CostOfGoodsAndServicesSold | 52,761,000 us-gaap_CostOfGoodsAndServicesSold | 43,642,000 us-gaap_CostOfGoodsAndServicesSold | 46,469,000 us-gaap_CostOfGoodsAndServicesSold | 34,231,000 us-gaap_CostOfGoodsAndServicesSold | 220,138,000 us-gaap_CostOfGoodsAndServicesSold | 177,103,000 us-gaap_CostOfGoodsAndServicesSold | 143,810,000 us-gaap_CostOfGoodsAndServicesSold
Gross profit | 20,909,000 us-gaap_GrossProfit | 24,428,000 us-gaap_GrossProfit | 18,420,000 us-gaap_GrossProfit | 17,816,000 us-gaap_GrossProfit | 23,921,000 us-gaap_GrossProfit | 21,926,000 us-gaap_GrossProfit | 19,705,000 us-gaap_GrossProfit | 16,014,000 us-gaap_GrossProfit | 81,573,000 us-gaap_GrossProfit | 81,566,000 us-gaap_GrossProfit | 69,341,000 us-gaap_GrossProfit
Operating expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |
General and administrative | 10,031,000 us-gaap_GeneralAndAdministrativeExpense | 12,628,000 us-gaap_GeneralAndAdministrativeExpense | 9,812,000 us-gaap_GeneralAndAdministrativeExpense | 5,392,000 us-gaap_GeneralAndAdministrativeExpense | 11,766,000 us-gaap_GeneralAndAdministrativeExpense | 9,580,000 us-gaap_GeneralAndAdministrativeExpense | 8,706,000 us-gaap_GeneralAndAdministrativeExpense | 9,632,000 us-gaap_GeneralAndAdministrativeExpense | 37,863,000 us-gaap_GeneralAndAdministrativeExpense | 39,684,000 us-gaap_GeneralAndAdministrativeExpense | 25,807,000 us-gaap_GeneralAndAdministrativeExpense
Sales and marketing | 1,907,000 us-gaap_SellingAndMarketingExpense | 2,281,000 us-gaap_SellingAndMarketingExpense | 1,837,000 us-gaap_SellingAndMarketingExpense | 1,826,000 us-gaap_SellingAndMarketingExpense | 2,059,000 us-gaap_SellingAndMarketingExpense | 1,905,000 us-gaap_SellingAndMarketingExpense | 2,143,000 us-gaap_SellingAndMarketingExpense | 1,731,000 us-gaap_SellingAndMarketingExpense | 7,851,000 us-gaap_SellingAndMarketingExpense | 7,838,000 us-gaap_SellingAndMarketingExpense | 7,290,000 us-gaap_SellingAndMarketingExpense
Research and development | 611,000 us-gaap_ResearchAndDevelopmentExpense | 601,000 us-gaap_ResearchAndDevelopmentExpense | 539,000 us-gaap_ResearchAndDevelopmentExpense | 522,000 us-gaap_ResearchAndDevelopmentExpense | 541,000 us-gaap_ResearchAndDevelopmentExpense | 452,000 us-gaap_ResearchAndDevelopmentExpense | 398,000 us-gaap_ResearchAndDevelopmentExpense | 549,000 us-gaap_ResearchAndDevelopmentExpense | 2,273,000 us-gaap_ResearchAndDevelopmentExpense | 1,940,000 us-gaap_ResearchAndDevelopmentExpense | 1,930,000 us-gaap_ResearchAndDevelopmentExpense
Total operating expenses | 12,549,000 us-gaap_OperatingExpenses | 15,510,000 us-gaap_OperatingExpenses | 12,188,000 us-gaap_OperatingExpenses | 7,740,000 us-gaap_OperatingExpenses | 14,366,000 us-gaap_OperatingExpenses | 11,937,000 us-gaap_OperatingExpenses | 11,247,000 us-gaap_OperatingExpenses | 11,912,000 us-gaap_OperatingExpenses | 47,987,000 us-gaap_OperatingExpenses | 49,462,000 us-gaap_OperatingExpenses | 35,027,000 us-gaap_OperatingExpenses
Operating income | 8,360,000 us-gaap_OperatingIncomeLoss | 8,918,000 us-gaap_OperatingIncomeLoss | 6,232,000 us-gaap_OperatingIncomeLoss | 10,076,000 us-gaap_OperatingIncomeLoss | 9,555,000 us-gaap_OperatingIncomeLoss | 9,989,000 us-gaap_OperatingIncomeLoss | 8,458,000 us-gaap_OperatingIncomeLoss | 4,102,000 us-gaap_OperatingIncomeLoss | 33,586,000 us-gaap_OperatingIncomeLoss | 32,104,000 us-gaap_OperatingIncomeLoss | 34,314,000 us-gaap_OperatingIncomeLoss
Other expense [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net | 3,148,000 mpaa_InterestExpense-Net | 3,165,000 mpaa_InterestExpense-Net | 3,339,000 mpaa_InterestExpense-Net | 3,413,000 mpaa_InterestExpense-Net | 3,177,000 mpaa_InterestExpense-Net | 6,524,000 mpaa_InterestExpense-Net | 4,663,000 mpaa_InterestExpense-Net | 3,925,000 mpaa_InterestExpense-Net | 13,065,000 mpaa_InterestExpense-Net | 18,289,000 mpaa_InterestExpense-Net | 12,324,000 mpaa_InterestExpense-Net
Income from continuing operations before income tax expense | 5,212,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,753,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,893,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,663,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 6,378,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,465,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,795,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 177,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,521,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,815,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 21,990,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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
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 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 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 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 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

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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