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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Inventory reserve	$ 2,200,000	$ 4,400,000
Benefit to cost of revenues	2,100,000	800,000
Impairment charge	5,000,000	1,700,000
Facility exit costs		300,000
Payments received from customers	3,400,000	5,200,000
Percentage of tax benefit likely to be realized upon ultimate settlement	50.00%
Common equivalent shares not included in the calculation of diluted EPS	2,671,194	2,290,416	2,631,251
Net foreign currency transaction and hedging gains (losses)	1,000,000	3,100,000	8,000,000
Loss contingency accrual	1,800,000
Repatriated amount	1,500,000
Federal and state deferred tax liability	$ 5,444,000	$ 3,129,000
INOX Wind Limited. [Member] | Accounts Receivable [Member]
Risk percentage	41.00%	24.00%
CG Power Solutions UK Ltd. [Member] | Accounts Receivable [Member]
Risk percentage	17.00%	14.00%
Hyundai Heavy Industries Co. Ltd [Member] | Accounts Receivable [Member]
Risk percentage	11.00%	11.00%
Minimum [Member]
Warranty period	1 year
Maximum [Member]
Warranty period	3 years

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