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Minority Investments - Schedule of Net Investment Activity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Tres Amigas
Sep. 30, 2014
Blade Dynamics Ltd.
Mar. 31, 2014
Blade Dynamics Ltd.
Sep. 30, 2014
Blade Dynamics Ltd.
Mar. 31, 2014
Blade Dynamics Ltd.
Schedule Of Results Related To Equity Accounted Investees [Line Items]                  
Beginning Balance         $ 1,845     $ 3,690  
Minority interest in net losses         (410)        
Net foreign exchange rate impact 740 (635) 588 (566)       (226)  
Impairment           3,500 1,300 (3,464) 1,300
Ending Balance         $ 1,435 $ 0 $ 3,690 $ 0 $ 3,690