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Defined Contribution Plans (Details) - 401 (K) Plan [Member] - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Minimum age required to participate in defined contribution plan	21 years
Minimum service period required to participate in defined contribution plan	6 months
Employer's matching contribution	50.00%
Employer's maximum contribution specified as percentage of employee compensation	6.00%
Matching contributions vesting period	5 years
Matching contribution, amount	$ 445,000	$ 389,000	$ 353,000

X

- Definition

The vesting period of employer's matching contribution over the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
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Balance Type:	na
Period Type:	duration

X

- Definition

The minimum age of employees who are eligible to cover under defined contribution plan service.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:durationItemType
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X

- Definition

The minimum service period of employees who are eligible to cover under defined contribution plan service.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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X

- Details

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