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Equity Investments (Tables)
12 Months Ended
Mar. 31, 2012
Tres Amigas [Member]
 
Schedule of Equity Method Investments [Line Items]  
Schedule Of Net Investment Activity
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]  
Schedule Of Net Investment Activity
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