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Contract Liabilities (Details) - USD ($)	Jun. 30, 2018	Mar. 31, 2018
Short-term contract liabilities [Abstract]
Customer allowances earned	$ 7,409,000	$ 11,370,000
Customer core returns accruals	4,154,000	4,697,000
Accrued core payment, net	20,520,000	16,536,000
Total short-term contract liabilities	32,083,000	32,603,000
Long-term contract liabilities [Abstract]
Customer core returns accruals	29,035,000	29,710,000
Accrued core payment, net	16,631,000	18,473,000
Total long-term contract liabilities	45,666,000	48,183,000
Total contract liabilities	$ 77,749,000	$ 80,786,000

X

- Definition

The amount of obligations for accrued core payment, classified as current.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of obligations for accrued core payment, classified as noncurrent.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

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X

- Definition

The amount of obligation for customer allowances earned, classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of obligation representing the estimated future credits to be provided for Used Cores returned by the customers, classified as current.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
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Balance Type:	credit
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X

- Definition

The amount of obligation representing the estimated future credits to be provided for Used Cores returned by the customers, classified as noncurrent.

+ References

No definition available.

+ Details

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- References

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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