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Equity Investments (Tables)
 12 Months Ended
Mar. 31, 2013
Tres Amigas [Member]
  
Schedule of Equity Method Investments [Line Items]  
Schedule Of Net Investment Activity

 

 

 

Balance at April 1, 2012

$
3,859 

    Minority interest in net losses

 
(1,006)

Balance at March 31, 2013

$
2,853 

 

Blade Dynamics Ltd. [Member]
  
Schedule of Equity Method Investments [Line Items]  
Schedule Of Net Investment Activity

 

 

 

Balance at April 1, 2012

$
6,083 

    Minority interest in net losses

 
(1,225)

    Net foreign exchange rate impact

 
(247)

Balance at March 31, 2013

$
4,611