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Business Segments (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
Business Segments (Narrative) (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 segment MW	Sep. 30, 2011
Business Segments [Abstract]
Stock-based compensation expense	$ 2,044,000	$ 2,113,000	$ 4,039,000	$ 5,579,000
Megawatts of drive trains and power ratings			10
Number of reportable business segments			2
Advanced Payment Write Off		20,600,000		20,551,000
Restructuring costs		$ 4,300,000		$ 4,300,000

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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