Share Repurchase Program (Details) - Common Stock [Member]	9 Months Ended
Dec. 31, 2017 USD ($) shares
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, approved amount	$ 15,000,000
Shares utilized, amount	6,855,000
Shares available for repurchase, amount	$ 8,145,000
Shares repurchased and retired (in shares) \| shares	303,665

The cumulative equity impact of the value of stock that has been repurchased and retired since the inception of the repurchase program. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

No definition available.

Name:	mpaa_StockRepurchasedAndRetiredDuringPeriodCumulativeValue
Namespace Prefix:	mpaa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration