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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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