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Accounts Receivable - Net, Warranty Returns (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Warranty Returns [Abstract]
Warranty accrual included in customer returns RGA issued	$ 7,738,000		$ 7,738,000		$ 7,204,000
Warranty accrual included in customer finished goods returns accrual	11,414,000		11,414,000		$ 9,442,000
Change in warranty return accrual [Roll Forward]
Balance at beginning of period	16,410,000	$ 14,799,000	16,646,000	$ 14,286,000
Charged to expense/additions	29,655,000	38,269,000	84,408,000	89,834,000
Amounts processed	(26,913,000)	(24,048,000)	(81,902,000)	(75,100,000)
Balance at end of period	$ 19,152,000	$ 29,020,000	$ 19,152,000	$ 29,020,000

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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Balance Type:	credit
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X

- 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_
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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=68068213&loc=d3e12565-110249

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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Balance Type:	debit
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X

- Definition

Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- References

No definition available.

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