Equity Investments (Schedule Of Net Investment Activity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Jun. 30, 2012	Jun. 30, 2011
Schedule of Equity Method Investments [Line Items]
Net foreign exchange rate impact	$ (1,168)	$ 1,134
Tres Amigas [Member]
Schedule of Equity Method Investments [Line Items]
Balance at April 1, 2012	3,859
Minority interest in net losses	(227)
Balance at June 3, 2012	3,632
Blade Dynamics Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Balance at April 1, 2012	6,083
Minority interest in net losses	(584)
Net foreign exchange rate impact	(350)
Balance at June 3, 2012	$ 5,149

Amount of Net Income (Loss) attributable to noncontrolling interest.

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Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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