XML 32 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Accounts Receivable Discount Programs (Tables) | 9 Months Ended
--- | ---
Dec. 31, 2012
Accounts Receivable Discount Programs [Abstract] |
Schedule of accounts receivable discount programs | The following is a summary of the Company's accounts receivable discount programs:
|  | Nine Months Ended |
|  | December 31, |
|  | 2012 |  |  | 2011 |
Receivables discounted |  | $ | 229,314,000 |  |  | $ | 197,019,000 |
Weighted average days |  |  | 316 |  |  |  | 314 |
Annualized weighted average discount rate |  |  | 2.8 | % |  |  | 2.9 | %
Amount of discount as interest expense |  | $ | 5,525,000 |  |  | $ | 4,984,000 |

X
- Details
Name: | mpaa_AccountsReceivableDiscountProgramsAbstract
Namespace Prefix: | mpaa_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of accounts receivable factored out to banks. Disclosure includes amounts factored, weighted average days, weighted average discount rate and amount of discount. + References No definition available. + Details
Name: | mpaa_ScheduleOfAccountsReceivableDiscountProgramsTableTextBlock
Namespace Prefix: | mpaa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration