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Business Segments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Business Segments (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 segment MW	Dec. 31, 2011
Business Segments [Abstract]
Number of reportable business segments			2
Megawatts of drive trains and power ratings			10
Stock-based compensation expense	$ 1,929,000	$ 2,118,000	$ 5,968,000	$ 7,697,000
Restructuring and impairment charges	6,700,000	4,100,000	6,800,000	8,400,000
Write-off of advanced payment to The Switch				$ 20,551,000

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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