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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
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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.

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- Definition The percentage of net sales for this customer for the periods indicated excludes the recognition of revenue from the reduction in our obligation to provide a credit for this major customer's Remanufactured Cores. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13531-108611 + Details
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