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Subsequent Events (Details) - Amended Credit Facility [Member] - USD ($)	Jun. 04, 2019	Mar. 31, 2019
Revolving Facility [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		$ 200,000,000
Revolving Facility [Member] | Canadian Borrowers [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		$ 20,000,000
Subsequent Event [Member] | Maximum [Member]
Credit Facility [Abstract]
Maximum sale and lease back transactions	$ 5,000,000
Subsequent Event [Member] | Revolving Facility [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	238,620,000
Subsequent Event [Member] | Revolving Facility [Member] | Canadian Borrowers [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	24,000,000
Subsequent Event [Member] | Revolving Facility [Member] | Letters of Credit [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	20,000,000
Subsequent Event [Member] | Revolving Facility [Member] | Swing Line Sublimit [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	$ 23,862,000

X

- Definition

Annual sale and lease back transactions permitted under the credit facility agreement.

+ References

No definition available.

+ Details

Name:	mpaa_AnnualSaleAndLeaseBackTransactionsPermitted
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=mpaa_RevolvingCreditFacilityCanadianBorrowersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=mpaa_SwingLineSublimitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: