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Intangible Assets (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
Intangible Assets (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Intangible Assets [Abstract]
Intangible amortization expense			$ 900,000	$ 2,600,000	$ 2,900,000
Patent costs	$ 4,900,000	$ 4,900,000		$ 4,917,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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