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Equity Transaction (Details) (USD $)
 1 Months Ended 12 Months Ended
Sep. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
May 09, 2014
Equity Transaction [Abstract]          
Securities authorized amount         $ 100,000,000mpaa_SecuritiesAuthorizedAmount
Shares issued as public offering (in shares) 2,760,000us-gaap_StockIssuedDuringPeriodSharesNewIssues        
Common stock issuance price (in dollars per share) $ 26.00us-gaap_SharePrice        
Option to purchase additional shares of common stock, maximum (in shares) 360,000mpaa_OptionToPurchaseAdditionalSharesOfCommonStockMaximum        
Aggregate gross proceeds from issuance of common stock 71,760,000us-gaap_ProceedsFromIssuanceOfCommonStock 71,760,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock 15,004,000us-gaap_ProceedsFromIssuanceOfCommonStock  
Aggregate net proceeds from issuance of common stock $ 66,973,000mpaa_NetProceedsFromIssuanceOfCommonStockAfterExpenses