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Subsequent Events (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Jun. 05, 2018
Letters of Credit [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	$ 15,000,000
Revolving Facility [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	120,000,000
Term Loans [Member]
Credit Facility [Abstract]
Maximum borrowing capacity	$ 25,000,000
New Credit Facility [Member]
Credit Facility [Abstract]
Debt instrument, maturity date	Jun. 05, 2023
Subsequent Event [Member] | New Credit Facility [Member] | Revolving Facility [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		$ 200,000,000
Subsequent Event [Member] | New Credit Facility [Member] | Revolving Facility [Member] | Canadian Borrowers [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		20,000,000
Subsequent Event [Member] | New Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		15,000,000
Subsequent Event [Member] | New Credit Facility [Member] | Term Loans [Member]
Credit Facility [Abstract]
Maximum borrowing capacity		$ 30,000,000

X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=mpaa_ParentCompanyNewCreditAgreementMember
Namespace Prefix:
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Period Type:

X

- Details

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- Details

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