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Major Customers and Suppliers (Details) (USD $)	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Concentration Risk [Line Items]
Excluded from sales percentage for credit on remanufactured cores	50,783,000
Sales [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	41.00%		41.00%		48.00%
Sales [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	15.00%		9.00%		18.00%
Sales [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	16.00%	[1]	14.00%	[1]	5.00%	[1]
Accounts Receivable - Trade [Member] | Customer A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	35.00%		31.00%
Accounts Receivable - Trade [Member] | Customer B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	6.00%		8.00%
Accounts Receivable - Trade [Member] | Customer C [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	4.00%	[1]	21.00%	[1]
Significant Supplier Purchases [Member] | Supplier A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	0.00%		2.00%		13.00%
Significant Supplier Purchases [Member] | Supplier B [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	12.00%		12.00%		0.00%
[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 year ended March 31, 2013 excludes the recognition of approximately $50,783,000 in revenue from the reduction in the Company's obligation to provide a credit for this major customer's Remanufactured Cores.

X

- 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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X

- 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

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