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Equity Investments (Schedule Of Net Investment Activity) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Net foreign exchange rate impact $ (1,790) $ 10,918 $ (2,487)
Tres Amigas [Member]
      
Schedule of Equity Method Investments [Line Items]      
Balance at April 1, 2011 3,026    
Purchase of minority investment 1,800    
Minority interest in net losses (967)    
Balance at March 31, 2012 3,859    
Blade Dynamics Ltd. [Member]
      
Schedule of Equity Method Investments [Line Items]      
Balance at April 1, 2011 7,903    
Minority interest in net losses (1,448)    
Net foreign exchange rate impact (372)    
Balance at March 31, 2012 $ 6,083