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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
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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

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