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Accounts Receivable - Net (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014
Accounts Receivable - Net [Abstract] |  |  |  |  |  |  |
Accounts receivable - trade | $ 46,018,000 us-gaap_AccountsReceivableGrossCurrent |  |  | $ 46,018,000 us-gaap_AccountsReceivableGrossCurrent |  |  | $ 58,766,000 us-gaap_AccountsReceivableGrossCurrent
Allowance for bad debts | (623,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  | (623,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  | (854,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Customer allowances earned | (12,153,000)mpaa_CustomerAllowancesEarned |  |  | (12,153,000)mpaa_CustomerAllowancesEarned |  |  | (9,088,000)mpaa_CustomerAllowancesEarned
Customer payment discrepancies | (487,000)mpaa_CustomerPaymentDiscrepancies |  |  | (487,000)mpaa_CustomerPaymentDiscrepancies |  |  | (577,000)mpaa_CustomerPaymentDiscrepancies
Customer returns RGA issued | (9,018,000)mpaa_CustomerReturnsRgaIssued |  |  | (9,018,000)mpaa_CustomerReturnsRgaIssued |  |  | (5,809,000)mpaa_CustomerReturnsRgaIssued
Customer core returns accruals | (24,638,000)mpaa_CustomerCoreReturnsAccrualsCurrent |  |  | (24,638,000)mpaa_CustomerCoreReturnsAccrualsCurrent |  |  | (20,155,000)mpaa_CustomerCoreReturnsAccrualsCurrent
Less: total accounts receivable offset accounts | (46,919,000)mpaa_TotalAccountsReceivableOffsetAccounts |  |  | (46,919,000)mpaa_TotalAccountsReceivableOffsetAccounts |  |  | (36,483,000)mpaa_TotalAccountsReceivableOffsetAccounts
Total accounts receivable - net | (901,000)us-gaap_AccountsReceivableNet | [1] |  | (901,000)us-gaap_AccountsReceivableNet | [1] |  | 22,283,000 us-gaap_AccountsReceivableNet
Warranty Returns [Abstract] |  |  |  |  |  |  |
Warranty accrual included in customer returns RGA issued | 3,355,000 mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued |  |  | 3,355,000 mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued |  |  | 2,407,000 mpaa_WarrantyAccrualIncludedInCustomerReturnsRgaIssued
Warranty accrual included in customer finished goods returns accrual | 3,648,000 mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual |  |  | 3,648,000 mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual |  |  | 5,632,000 mpaa_WarrantyAccrualIncludedInCustomerFinishedGoodsReturnsAccrual
Change in warranty return accrual [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period | 8,421,000 us-gaap_StandardProductWarrantyAccrual |  | 7,204,000 us-gaap_StandardProductWarrantyAccrual | 8,039,000 us-gaap_StandardProductWarrantyAccrual |  | 6,205,000 us-gaap_StandardProductWarrantyAccrual |
Charged to expense | 13,651,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued |  | 12,471,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued | 44,010,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued |  | 41,196,000 us-gaap_StandardProductWarrantyAccrualWarrantiesIssued |
Amounts processed | (15,069,000)us-gaap_StandardProductWarrantyAccrualPayments |  | (13,267,000)us-gaap_StandardProductWarrantyAccrualPayments | (45,046,000)us-gaap_StandardProductWarrantyAccrualPayments |  | (40,993,000)us-gaap_StandardProductWarrantyAccrualPayments |
Balance at end of period | $ 7,003,000 us-gaap_StandardProductWarrantyAccrual |  | $ 6,408,000 us-gaap_StandardProductWarrantyAccrual | $ 7,003,000 us-gaap_StandardProductWarrantyAccrual |  | $ 6,408,000 us-gaap_StandardProductWarrantyAccrual |
[1] | Accounts receivable -net has been reclassified and included in accrued liabilities in the consolidated balance sheet at December 31, 2014 (see Note 3).

X
- Definition The earned allowances given to customers which reduces trade accounts receivable. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the estimated future credits to be provided for Used Cores returned by the customers. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A reduction to trade accounts receivable for customer payment discrepancies. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A reduction from trade accounts receivable for returned goods authorization issued for in-transit unit returns. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The sum of the total accounts receivable offset accounts. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Amount as of the balance sheet date of the warranty estimate for which an RGA has not been issued and is included in the customer finished goods returns accrual liability. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount as of the balance sheet date of the warranty accrual for which an RGA has been issued and is included as an offset account to total net accounts receivable. + References No definition available. + Details
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Namespace Prefix: | mpaa_
Data Type: | xbrli:monetaryItemType
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- Details
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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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Balance Type: | debit
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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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- Definition Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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Balance Type: | debit
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- Definition Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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