Stock-Based Compensation (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011 Y	Mar. 31, 2010 Y
Stock-Based Compensation [Abstract]
Number of Options outstanding, Beginning Balance	860,779	2,431,233	2,643,175
Number of Options, Granted			539,506
Number of Options, Exercised	(227,116)	(1,415,391)	(667,862)
Number of Options, Canceled		(155,063)	(83,586)
Number of Options outstanding, Ending Balance	633,663	860,779	2,431,233
Options outstanding, Weighted Average Remaining Contract Term, Beginning Balance	6.2	4.0	4.2
Options outstanding, Weighted Average Exercise Price, Beginning Balance	$ 19.52	$ 17.69	$ 16.70
Weighted Average Exercise Price, Granted			$ 16.21
Weighted Average Exercise Price, Exercised	$ 15.82	$ 15.34	$ 12.22
Weighted Average Exercise Price, Canceled		$ 29.32	$ 21.43
Options outstanding, Weighted Average Exercise Price, Ending Balance	$ 20.85	$ 19.52	$ 17.69
Options outstanding, Weighted Average Remaining Contract Term, Ending Balance	6.1	6.2	4.0
Options outstanding, Aggregate Intrinsic Value, Beginning Balance	$ 17,129	$ 19,191	$ 1,752
Aggregate Intrinsic Value, Exercised	3,691	18,482	7,125
Aggregate Intrinsic Value, Canceled		9	522
Options outstanding, Aggregate Intrinsic Value, Ending Balance	8,879	17,129	19,191
Options exercisable, Number of Options, Ending Balance	523,626
Options exercisable, Weighted Average Remaining Contract Term, Ending Balance	5.9
Options exercisable, Weighted Average Exercise Price, Ending Balance	$ 21.82
Options exercisable, Aggregate Intrinsic Value, Ending Balance	6,826
Options expected to vest, Number of Options, Ending Balance	110,037
Options expected to vest, Weighted Average Remaining Contract Term, Ending Balance	7.1
Options expected to vest, Weighted Average Exercise Price, Ending Balance	$ 16.20
Options expected to vest, Aggregate Intrinsic Value, Ending Balance	$ 2,053