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Business Segments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Business Segments (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 mW	Dec. 31, 2010
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 2,118,000	$ 2,248,000	$ 7,697,000	$ 10,073,000
Maximum range of drive trains and power ratings (in megawatts)			10
Unallocated Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Advance payment to The Switch			20,600,000
Restructuring costs and asset impairment charges	4,100,000		8,400,000
Stock-based compensation expense	$ 2,100,000	$ 2,200,000	$ 7,700,000	$ 10,100,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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