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Business Segments (Operating Results For Two Business Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]        
Revenues $ 17,417 $ 18,058 $ 67,000 $ 47,916
Operating (loss) income (20,616) (26,569) (41,714) (116,020)
Wind [Member]
        
Segment Reporting Information [Line Items]        
Revenues 6,808 10,125 35,321 27,836
Operating (loss) income (5,365) (14,014) (10,514) (54,719)
Grid [Member]
        
Segment Reporting Information [Line Items]        
Revenues 10,609 7,933 31,679 20,080
Operating (loss) income (6,705) (6,313) (18,620) (24,511)
Unallocated Corporate Expenses [Member]
        
Segment Reporting Information [Line Items]        
Operating (loss) income $ (8,546) $ (6,242) $ (12,580) $ (36,790)