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Business Segment And Geographic Information (Tables)
 12 Months Ended
Mar. 31, 2012
Business Segment And Geographic Information [Abstract]  
Operating Results For Two Business Segments
    For the years ended March 31,
Revenues   2012   2011   2010
Wind $ 44,642 $ 231,761 $ 251,487
Grid   31,901   54,842   64,468
Total $ 76,543 $ 286,603 $ 315,955

 

    For the years ended March 31,  
Operating (loss) income   2012     2011     2010  
Wind $ (62,217 ) $ (100,546 ) $ 91,000  
Grid   (29,645 )   (63,855 )   (37,828 )
Unallocated corporate expenses   (44,577 )   (13,582 )   (14,511 )
Total $ (136,439 ) $ (177,983 ) $ 38,661  
Total Business Segments Assets
    March 31,  
    2012   2011
Wind $ 70,054 $ 78,700
Grid   89,091   85,607
Corporate assets   95,911   276,902
Total $ 255,056 $ 441,209
Geographic Information About Revenue, Based On Shipments To Customers By Region
    For the years ended March 31,
    2012   2011   2010
U.S $ 21,347 $ 18,642 $ 40,750
North America and South America   1,219   6,670   4,441
Europe   2,868   10,289   14,758
China   16,929   219,194   241,462
Korea   12,486   10,281   8,245
India   14,212   3,835   1,787
Other Asia-Pacific   7,482   17,692   4,512
Total $ 76,543 $ 286,603 $ 315,955
Geographic Information About Property, Plant And Equipment Associated With Particular Regions
    March 31,
    2012   2011
U.S and other North America $ 83,421 $ 86,971
Europe   3,538   5,895
Asia-Pacific   3,869   3,628
Total $ 90,828 $ 96,494