Name:	mpaa_AllowancesIncurredUnderLongTermCustomerContracts
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The reduction in revenue recognized during an accounting period related to core inventory purchase obligations. Allowances are a deduction from gross revenue in arriving at net revenue.

No definition available.

Name:	mpaa_AllowancesRelatedToCoreInventoryPurchaseObligations
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The reduction in revenue recognized during an accounting period related to a single exchange of product. Allowances are a deduction from gross revenue in arriving at net revenue.

No definition available.

Name:	mpaa_AllowancesRelatedToSingleExchangeOfProduct
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of each workers compensation claim for which the Company is liable.

No definition available.

Name:	mpaa_AmountOfEachWorkersCompensationClaimForWhichCompanyIsLiable
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	mpaa_CommitmentsToProvideMarketingAllowancesUnderLongTermCustomerContractsAbstract
Namespace Prefix:	mpaa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Future minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement as of the balance sheet date.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligations
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing after the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueAfterFifthYear
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the fifth fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInFifthYear
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the fourth fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInFourthYear
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the next fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInNextTwelveMonths
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the second fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInSecondYear
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of marketing allowances and customer Remanufactured Core purchase arrangement maturing in the third fiscal year following the latest fiscal year.

No definition available.

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsDueInThirdYear
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	mpaa_MarketingAllowancesAndCustomerRemanufacturedCorePurchaseObligationsFiscalYearMaturityAbstract
Namespace Prefix:	mpaa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The period prior to January 1, 2007, over which the Company purchased workers compensation insurance on a large deductible plan.

No definition available.

Name:	mpaa_PeriodOverWhichCompanyPurchasedWorkersCompensationInsuranceOnLargeDeductiblePlan
Namespace Prefix:	mpaa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The aggregate reduction in revenue recognized during an accounting period for customer allowances. Allowances are a deduction from gross revenue in arriving at net revenue.

No definition available.

Name:	mpaa_TotalCustomerAllowancesRecordedAsReductionOfRevenue
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	mpaa_WorkersCompensationInsuranceAbstract
Namespace Prefix:	mpaa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant