Equity Compensation (Summary Of Outstanding And Exercisable Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Number	5,904
Options Outstanding, Weighted Average Remaining Contractual Life	6 years 8 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 8.23
Options Exercisable, Number Exercisable	3,836
Options Exercisable, Weighted Average Exercise Price	$ 7.08
$1.83 - $5.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 1.83
Range of Exercise Prices, upper limit	$ 5.25
Options Outstanding, Number	1,332
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 10 months 6 days
Options Outstanding, Weighted Average Exercise Price	$ 4.94
Options Exercisable, Number Exercisable	1,039
Options Exercisable, Weighted Average Exercise Price	$ 4.93
$5.27 - $5.53 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 5.27
Range of Exercise Prices, upper limit	$ 5.53
Options Outstanding, Number	91
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 2 months 16 days
Options Outstanding, Weighted Average Exercise Price	$ 5.49
Options Exercisable, Number Exercisable	48
Options Exercisable, Weighted Average Exercise Price	$ 5.48
$5.55 - $5.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 5.55
Range of Exercise Prices, upper limit	$ 5.55
Options Outstanding, Number	1,515
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 6 months
Options Outstanding, Weighted Average Exercise Price	$ 5.55
Options Exercisable, Number Exercisable	798
Options Exercisable, Weighted Average Exercise Price	$ 5.55
$5.66 - $7.26 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 5.66
Range of Exercise Prices, upper limit	$ 7.26
Options Outstanding, Number	1,100
Options Outstanding, Weighted Average Remaining Contractual Life	5 years 3 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 6.54
Options Exercisable, Number Exercisable	1,045
Options Exercisable, Weighted Average Exercise Price	$ 6.53
$7.32 - $15.41 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 7.32
Range of Exercise Prices, upper limit	$ 15.41
Options Outstanding, Number	1,141
Options Outstanding, Weighted Average Remaining Contractual Life	7 years 11 days
Options Outstanding, Weighted Average Exercise Price	$ 11.38
Options Exercisable, Number Exercisable	604
Options Exercisable, Weighted Average Exercise Price	$ 8.42
$16.21 - $23.33 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower limit	$ 16.21
Range of Exercise Prices, upper limit	$ 23.33
Options Outstanding, Number	725
Options Outstanding, Weighted Average Remaining Contractual Life	8 years 2 months 5 days
Options Outstanding, Weighted Average Exercise Price	$ 17.77
Options Exercisable, Number Exercisable	302
Options Exercisable, Weighted Average Exercise Price	$ 18.05