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Business Segments (Operating Results For Two Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Segment Reporting Information [Line Items] |  |
Revenues | $ 28,716 | $ 9,058
Operating (loss) income | (6,128) | (38,327)
Wind [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 16,511 | 4,262
Operating (loss) income | 1,301 | (24,370)
Grid [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 12,205 | 4,796
Operating (loss) income | (5,343) | (10,552)
Unallocated Corporate Expenses [Member] |  |
Segment Reporting Information [Line Items] |  |
Operating (loss) income | $ (2,086) | $ (3,405)

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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