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Major Customers (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2012
Sales [Member]
Customer A [Member]
Dec. 31, 2011
Sales [Member]
Customer A [Member]
Dec. 31, 2012
Sales [Member]
Customer A [Member]
Dec. 31, 2011
Sales [Member]
Customer A [Member]
Dec. 31, 2012
Sales [Member]
Customer B [Member]
Dec. 31, 2011
Sales [Member]
Customer B [Member]
Dec. 31, 2012
Sales [Member]
Customer B [Member]
Dec. 31, 2011
Sales [Member]
Customer B [Member]
Dec. 31, 2012
Sales [Member]
Customer C [Member]
Dec. 31, 2011
Sales [Member]
Customer C [Member]
Dec. 31, 2012
Sales [Member]
Customer C [Member]
Dec. 31, 2011
Sales [Member]
Customer C [Member]
Dec. 31, 2012
Accounts Receivable - Trade [Member]
Customer A [Member]
Mar. 31, 2012
Accounts Receivable - Trade [Member]
Customer A [Member]
Dec. 31, 2012
Accounts Receivable - Trade [Member]
Customer B [Member]
Mar. 31, 2012
Accounts Receivable - Trade [Member]
Customer B [Member]
Dec. 31, 2012
Accounts Receivable - Trade [Member]
Customer C [Member]
Mar. 31, 2012
Accounts Receivable - Trade [Member]
Customer C [Member]
Dec. 31, 2012
Significant Supplier Purchases [Member]
Supplier A [Member]
Dec. 31, 2011
Significant Supplier Purchases [Member]
Supplier A [Member]
Dec. 31, 2012
Significant Supplier Purchases [Member]
Supplier A [Member]
Dec. 31, 2011
Significant Supplier Purchases [Member]
Supplier A [Member]
Concentration Risk [Line Items]                                                
Concentration risk percentage (in hundredths)     37.00% 48.00% 37.00% 45.00% 17.00% 11.00% 16.00% 9.00% 14.00% [1] 12.00% [1] 19.00% [1] 13.00% [1] 31.00% 31.00% 5.00% 8.00% 9.00% [1] 21.00% [1] 4.00% 7.00% 14.00% 11.00%
Excluded from sales percentage for credit on remanufactured cores $ 50,783,000 $ 50,783,000                                            
[1] The Company discontinued supplying its undercar products to customer C but has retained the rotating electrical product line sales to this customer. The percentage of net sales for this customer for the three and nine months ended December 31, 2012 excludes the recognition of approximately $50,783,000 in revenue from the reduction in our obligation to provide a credit for this major customer’s Remanufactured Cores.