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Equity Investments (Schedule Of Net Investment Activity) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]        
Net foreign exchange rate impact $ (1,157) $ (5,386) $ (2,264) $ (1,215)
Blade Dynamics Ltd. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Balance at April 1, 2011     7,903  
Minority interest in net losses     (880)  
Net foreign exchange rate impact     (561)  
Balance at December 31, 2011 6,462   6,462  
Tres Amigas [Member]
        
Schedule of Equity Method Investments [Line Items]        
Balance at April 1, 2011     3,026  
Purchase of minority investment 1,800   1,800  
Minority interest in net losses     (741)  
Balance at December 31, 2011 $ 4,085   $ 4,085