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Defined Contribution Plans (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
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	$ 117,000	$ 102,000	$ 92,000
Retirement Savings Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum service period required to participate in defined contribution plan	1 year
Matching contribution, amount	$ 255,000	$ 343,000
Vesting period from the date of enrollment	2 years
Retirement Savings Plan [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's maximum contribution specified as percentage of employee compensation (in hundredths)	3.00%
Retirement Savings Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's maximum contribution specified as percentage of employee compensation (in hundredths)	10.00%

X

- Definition

The defined contribution plans vesting period from the date of enrollment into the plan.

+ References

No definition available.

+ Details

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

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ 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

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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