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Consolidated Statements of Cash Flows (Unaudited) (USD $) | 9 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Cash flows from operating activities: |  |
Net income | $ 8,351,000 us-gaap_NetIncomeLoss | $ 104,292,000 us-gaap_NetIncomeLoss
Less income from discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 100,877,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Income from continuing operations | 8,351,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 3,415,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Adjustments to reconcile net income from continuing operations to net cash provided by operating activities: |  |
Depreciation | 1,355,000 us-gaap_Depreciation | 1,533,000 us-gaap_Depreciation
Amortization of intangible assets | 510,000 us-gaap_AmortizationOfIntangibleAssets | 558,000 us-gaap_AmortizationOfIntangibleAssets
Amortization of debt issuance costs | 1,274,000 us-gaap_AmortizationOfFinancingCosts | 4,157,000 us-gaap_AmortizationOfFinancingCosts
Loss due to change in fair value of warrant liability | 2,199,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings | 6,881,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Gain on extinguishment of warrant liability | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (216,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain on redemption of short term investment | (4,000)us-gaap_GainLossOnSaleOfInvestments | 0 us-gaap_GainLossOnSaleOfInvestments
Provision for inventory reserves | 839,000 us-gaap_InventoryWriteDown | 1,062,000 us-gaap_InventoryWriteDown
Net recovery of customer payment discrepancies | (292,000)us-gaap_ProvisionForOtherLosses | (210,000)us-gaap_ProvisionForOtherLosses
Provision for (net recovery of) doubtful accounts | 178,000 us-gaap_ProvisionForDoubtfulAccounts | (47,000)us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes | (1,067,000)us-gaap_DeferredIncomeTaxExpenseBenefit | 14,220,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation expense | 1,697,000 us-gaap_ShareBasedCompensation | 549,000 us-gaap_ShareBasedCompensation
Impact of tax benefit on APIC pool from stock options exercised | 90,000 mpaa_ImpactOfTaxBenefitOnApicPoolFromStockOptionsExercisedOperatingActivities | 717,000 mpaa_ImpactOfTaxBenefitOnApicPoolFromStockOptionsExercisedOperatingActivities
Loss on disposals of plant and equipment | 1,000 us-gaap_GainLossOnDispositionOfAssets | 8,000 us-gaap_GainLossOnDispositionOfAssets
Changes in current assets and liabilities: |  |
Accounts receivable | 22,398,000 us-gaap_IncreaseDecreaseInAccountsReceivable | 1,507,000 us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory | (11,576,000)mpaa_IncreaseDecreaseInInventory | (10,210,000)mpaa_IncreaseDecreaseInInventory
Inventory unreturned | (512,000)mpaa_IncreaseDecreaseInInventoryUnreturned | (218,000)mpaa_IncreaseDecreaseInInventoryUnreturned
Prepaid expenses and other current assets | 427,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 5,689,000 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets | (378,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (353,000)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities | 1,740,000 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 8,876,000 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Customer finished goods returns accrual | 722,000 mpaa_IncreaseDecreaseInCustomerFinishedGoodsReturnsAccrual | (1,359,000)mpaa_IncreaseDecreaseInCustomerFinishedGoodsReturnsAccrual
Deferred core revenue | (15,065,000)us-gaap_DeferredRevenuePeriodIncreaseDecrease | 1,395,000 us-gaap_DeferredRevenuePeriodIncreaseDecrease
Long-term core inventory | (10,728,000)mpaa_IncreaseDecreaseInLong-TermCoreInventory | (17,244,000)mpaa_IncreaseDecreaseInLong-TermCoreInventory
Long-term core inventory deposits | (2,196,000)mpaa_IncreaseDecreaseInLong-TermCoreInventoryDeposits | (1,247,000)mpaa_IncreaseDecreaseInLong-TermCoreInventoryDeposits
Other liabilities | 2,963,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 262,000 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities from continuing operations | 2,926,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 19,725,000 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Net cash provided by operating activities from discontinued operations | 0 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 979,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities | 2,926,000 us-gaap_NetCashProvidedByUsedInOperatingActivities | 20,704,000 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |
Purchase of plant and equipment | (2,551,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (2,154,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Change in short term investments | (77,000)us-gaap_PaymentsForProceedsFromShortTermInvestments | (35,000)us-gaap_PaymentsForProceedsFromShortTermInvestments
Net cash used in investing activities from continuing operations | (2,628,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (2,189,000)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Net cash used in investing activities from discontinued operations | 0 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | (295,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash used in investing activities | (2,628,000)us-gaap_NetCashProvidedByUsedInInvestingActivities | (2,484,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |
Borrowings under revolving loan | 0 us-gaap_ProceedsFromLongTermLinesOfCredit | 10,000,000 us-gaap_ProceedsFromLongTermLinesOfCredit
Repayment of revolving loan | (10,000,000)us-gaap_RepaymentsOfLongTermLinesOfCredit | 0 us-gaap_RepaymentsOfLongTermLinesOfCredit
Proceeds from term loan | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 20,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of term loan | (6,300,000)us-gaap_RepaymentsOfLongTermDebt | (9,500,000)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs | 0 us-gaap_PaymentsOfFinancingCosts | (5,221,000)us-gaap_PaymentsOfFinancingCosts
Payments on capital lease obligations | (48,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations | (156,000)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Exercise of stock options | 1,152,000 us-gaap_ProceedsFromStockOptionsExercised | 3,555,000 us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefit related to share-based compensation | 925,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 491,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Cash used to net share settle equity awards | (806,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation | 0 us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Repurchase of common stock and options, including fees | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | (627,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Repurchase of warrants | 0 us-gaap_PaymentsForRepurchaseOfWarrants | (2,194,000)us-gaap_PaymentsForRepurchaseOfWarrants
Proceeds from issuance of common stock | 71,760,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock
Stock issuance costs | (4,787,000)us-gaap_PaymentsOfStockIssuanceCosts | 0 us-gaap_PaymentsOfStockIssuanceCosts
Net cash provided by financing activities from continuing operations | 51,896,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 16,348,000 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash used in financing activities from discontinued operations | 0 us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations | (20,636,000)us-gaap_CashProvidedByUsedInFinancingActivitiesDiscontinuedOperations
Net cash provided by (used in) financing activities | 51,896,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | (4,288,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (75,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (36,000)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents | 52,119,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 13,896,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents - Beginning of period from continuing operations | 24,599,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 19,346,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents - Beginning of period from discontinued operations | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationCash | 88,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationCash
Cash and cash equivalents - End of period | 76,718,000 us-gaap_CashIncludingDiscontinuedOperations | 33,330,000 us-gaap_CashIncludingDiscontinuedOperations
Less Cash - End of period from discontinued operations | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationCash | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationCash
Cash and cash equivalents - End of period from continuing operations | 76,718,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 33,330,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the period for: |  |
Interest, net | 8,642,000 us-gaap_InterestPaidNet | 12,095,000 us-gaap_InterestPaidNet
Income taxes, net of refunds | 3,981,000 us-gaap_IncomeTaxesPaidNet | (16,472,000)us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities: |  |
Property acquired under capital lease | $ 6,000 us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 | $ 34,000 us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition Amount of expense related to other loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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