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Business Segments (Schedule Of Business Segments Operating Results) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 18,058	$ 31,570	$ 47,916	$ 226,853
Operating (loss) income	(26,569)	(22,960)	(116,020)	6,198
Wind [Member]
Segment Reporting Information [Line Items]
Revenues	10,125	10,840	27,836	183,162
Operating (loss) income	(14,014)	(12,494)	(54,719)	51,499
Grid [Member]
Segment Reporting Information [Line Items]
Revenues	7,933	20,730	20,080	43,691
Operating (loss) income	(6,313)	(8,189)	(24,511)	(35,166)
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Operating (loss) income	$ (6,242)	$ (2,277)	$ (36,790)	$ (10,135)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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X

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: 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

+ Details

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- Details

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