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Defined Contribution Plans (Details) (401 (K) Plan [Member], USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
401 (K) Plan [Member]
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 (in hundredths)	25.00%
Employer's maximum contribution specified as percentage of employee compensation (in hundredths)	6.00%
Matching contributions vesting period	5 years
Matching contribution, amount	$ 126,000	$ 117,000	$ 102,000

X

- Definition

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

+ References

No definition available.

+ Details

Name:	mpaa_MatchingContributionsVestingPeriod
Namespace Prefix:	mpaa_
Data Type:	xbrli:durationItemType
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

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
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

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration