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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended			3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2011 Windtec [Member]	Mar. 31, 2011 PSNA [Member]
Goodwill [Line Items]
Impairment charges		$ 48,959,000		$ 42,100,000	$ 6,900,000
Intangible amortization expense	2,600,000	2,900,000	2,700,000
Patent costs	$ 4,917,000

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Aggregate amount of intangible asset amortization recognized as expense during the period.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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