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Business Segments (Schedule Of Revenues By Major Customers) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
CG Power Solutions UK Ltd. [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage | 20.80% |  | 10.00% |
E.ON Climate & Renewables [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage | 19.40% |  | 10.00% |
INOX Wind Limited [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage | 18.90% | 26.50% | 17.30% | 20.50%
Beijing JINGCHENG New Energy Co., Ltd. [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage | 10.00% | 10.00% | 16.70% | 10.00%
Doosan Heavy Industries & Construction Co Ltd. [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage | 10.00% | 12.10% | 10.00% | 14.80%
Ergon Energy Corporation Limited [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue percentage |  | 10.60% |  | 10.00%

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration