Major Customers (Details)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended					12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended
	Sep. 30, 2012 Sales [Member] Customer A [Member]	Sep. 30, 2011 Sales [Member] Customer A [Member]	Sep. 30, 2012 Sales [Member] Customer A [Member]	Sep. 30, 2011 Sales [Member] Customer A [Member]	Sep. 30, 2012 Sales [Member] Customer B [Member]	Sep. 30, 2011 Sales [Member] Customer B [Member]	Sep. 30, 2012 Sales [Member] Customer B [Member]	Sep. 30, 2011 Sales [Member] Customer B [Member]	Sep. 30, 2012 Sales [Member] Customer C [Member]		Sep. 30, 2011 Sales [Member] Customer C [Member]		Sep. 30, 2012 Sales [Member] Customer C [Member]		Sep. 30, 2011 Sales [Member] Customer C [Member]		Sep. 30, 2012 Accounts Receivable - Trade [Member] Customer A [Member]	Mar. 31, 2012 Accounts Receivable - Trade [Member] Customer A [Member]	Sep. 30, 2012 Accounts Receivable - Trade [Member] Customer B [Member]	Mar. 31, 2012 Accounts Receivable - Trade [Member] Customer B [Member]	Sep. 30, 2012 Accounts Receivable - Trade [Member] Customer C [Member]		Mar. 31, 2012 Accounts Receivable - Trade [Member] Customer C [Member]		Sep. 30, 2012 Significant supplier purchases [Member] Supplier A [Member]	Sep. 30, 2011 Significant supplier purchases [Member] Supplier A [Member]	Sep. 30, 2012 Significant supplier purchases [Member] Supplier A [Member]	Sep. 30, 2011 Significant supplier purchases [Member] Supplier A [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	38.00%	43.00%	37.00%	40.00%	16.00%	7.00%	16.00%	8.00%	21.00%	[1]	15.00%	[1]	20.00%	[1]	13.00%	[1]	29.00%	31.00%	9.00%	8.00%	22.00%	[1]	21.00%	[1]	19.00%	11.00%	18.00%	13.00%

[1] As noted in Note 3, the Company discontinued supplying its undercar products to customer C but has retained the rotating electrical product line sales to this customer.