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Description Of The Business And Basis Of Presentation (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
mW
Dec. 31, 2010
Mar. 31, 2011
Entity-Wide Information, Revenue from External Customer [Line Items]          
Maximum range of drive trains and power ratings (in megawatts)     10    
Cash, cash equivalents, and marketable securities $ 63,900,000   $ 63,900,000    
Net loss 26,271,000 18,158,000 115,660,000 1,150,000  
Adverse purchase commitments for inventory 28,763,000   28,763,000   38,763,000
Headcount reduced due to restructuring activities, percentage of work force     50.00%    
Expected annual savings due to workforce reduction     50,000,000    
Number of workforce persons, minimum 400   400    
Loss On Long-Term Purchase Commitment [Member]
          
Entity-Wide Information, Revenue from External Customer [Line Items]          
Write-off of an advance payment     $ 20,600,000