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Business Segments (Schedule Of Business Segments Operating Results) (Details) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 9,058	$ 97,209
Operating (loss) income	(38,327)	16,081
Wind [Member]
Revenues	4,262	83,006
Operating (loss) income	(24,370)	31,339
Grid [Member]
Revenues	4,796	14,203
Operating (loss) income	(10,552)	(11,764)
Unallocated Corporate Expenses [Member]
Operating (loss) income	$ (3,405)	$ (3,494)

X

- Definition

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

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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
-Section 03
-Paragraph 1
-Article 5

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration