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Inventory (Details) (USD $)	Dec. 31, 2014	Mar. 31, 2014
Non-core Inventory [Abstract]
Raw materials	$ 19,203,000us-gaap_InventoryRawMaterials	$ 18,787,000us-gaap_InventoryRawMaterials
Work-in-process	265,000us-gaap_InventoryWorkInProcess	124,000us-gaap_InventoryWorkInProcess
Finished goods	41,022,000us-gaap_InventoryFinishedGoods	30,197,000us-gaap_InventoryFinishedGoods
Non-core inventory, gross	60,490,000us-gaap_InventoryGross	49,108,000us-gaap_InventoryGross
Less allowance for excess and obsolete inventory	(1,959,000)mpaa_InventoryValuationReservesNonCore	(1,862,000)mpaa_InventoryValuationReservesNonCore
Total	58,531,000mpaa_NetInventory	47,246,000mpaa_NetInventory
Inventory unreturned	8,046,000mpaa_InventoryUnreturned	7,534,000mpaa_InventoryUnreturned
Long-term core inventory [Abstract]
Used cores held at the Company's facilities	25,797,000mpaa_UsedCoresHeldAtFacilities	23,718,000mpaa_UsedCoresHeldAtFacilities
Used cores expected to be returned by customers	8,294,000mpaa_UsedCoresExpectedToBeReturnedByCustomers	6,160,000mpaa_UsedCoresExpectedToBeReturnedByCustomers
Remanufactured cores held in finished goods	21,698,000mpaa_RemanufacturedCoresHeldInFinishedGoods	18,093,000mpaa_RemanufacturedCoresHeldInFinishedGoods
Remanufactured cores held at customers' locations	98,560,000mpaa_RemanufacturedCoresHeldAtCustomersLocations	96,351,000mpaa_RemanufacturedCoresHeldAtCustomersLocations
Long-term core inventory - gross	154,349,000mpaa_LongtermCoreInventory-Gross	144,322,000mpaa_LongtermCoreInventory-Gross
Less allowance for excess and obsolete inventory	(701,000)mpaa_InventoryValuationReservesLongTermCore	(846,000)mpaa_InventoryValuationReservesLongTermCore
Total	153,648,000mpaa_LongtermCoreInventoryNet	143,476,000mpaa_LongtermCoreInventoryNet
Long-term core inventory deposits	$ 31,571,000mpaa_LongtermCoreInventoryDeposit	$ 29,375,000mpaa_LongtermCoreInventoryDeposit

X

- Definition

Carrying amount as of the balance sheet date of the added unit value of finished goods shipped to customers that the entity expects to be returned within the normal operating cycle of one year.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of long-term core inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

+ References

No definition available.

+ Details

Name:	mpaa_InventoryValuationReservesLongTermCore
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of non-core inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

+ References

No definition available.

+ Details

Name:	mpaa_InventoryValuationReservesNonCore
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X

- Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount (lower of cost or market) of remanufactured cores the Company has purchased from its customers, which are held by the customers and remain on the customers' premises.

+ References

No definition available.

+ Details

Name:	mpaa_LongtermCoreInventoryDeposit
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Gross amount (lower of cost or market) as of the balance sheet date of (1) used cores held in inventory at Company facilities, (2) used cores expected to be returned by the Company's customers, (3) remanufactured cores held in finished goods at Company facilities, and (4) remanufactured cores held at customers locations.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Carrying amount (lower of cost or market) as of the balance sheet date of (1) used cores held in inventory at Company facilities, (2) used cores expected to be returned by the Company's customers, (3) remanufactured cores held in finished goods at Company facilities, and (4) remanufactured cores held at customers locations, less all valuation and other allowances.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Carrying amount (lower of cost or market) as of the balance sheet date of (1) non-core raw materials, (2) the non-core value of work in process, and (3) the non-core value of finished goods, less all valuation and other allowances. Excludes noncurrent inventory balances for (1) used cores, (2) the used core value of work in process, and (3) the remanufactured core portion of finished goods.

+ References

No definition available.

+ Details

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- Details

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Balance Type:	na
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X

- Definition

Gross amount of remanufactured cores held at customers' locations as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Gross amount of remanufactured cores held in finished goods as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	mpaa_
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X

- Definition

Gross amount of used cores expected to be returned by customers as of the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Gross amount of used cores held at the facilities as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	mpaa_UsedCoresHeldAtFacilities
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(4))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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