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Equity Investments (Schedule Of Net Investment Activity) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2010
Schedule of Equity Method Investments [Line Items] |  |  |
Net foreign exchange rate impact | $ (1,790) | $ 10,918 | $ (2,487)
Tres Amigas [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
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] |  |  |
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 |  |

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