Stock-Based Compensation And Employee Benefit Plans (Summary Of Outstanding And Exercisable Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, number of shares	5,311	7,802
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 7 months 1 day
Options Outstanding, Weighted-Average Exercise Prices	$ 37.43	$ 34.17
Options exercisable, number of shares	4,191
Options exercisable, weighted-average exercise prices	$ 40.70
$11.53 - $19.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 11.53
Range of Exercise Prices, Maximum	$ 19.99
Options outstanding, number of shares	911
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 10 months 25 days
Options Outstanding, Weighted-Average Exercise Prices	$ 17.40
Options Outstanding, Potential Dilution	0.30%
Options exercisable, number of shares	845
Options exercisable, weighted-average exercise prices	$ 17.69
Options Exercisable, Potential Dilution	0.30%
$20.00 - $29.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 20
Options outstanding, number of shares	1,752
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	7 years 9 months 5 days
Options Outstanding, Weighted-Average Exercise Prices	$ 24.03
Options Outstanding, Potential Dilution	0.60%
Options exercisable, number of shares	697
Options exercisable, weighted-average exercise prices	$ 21.16
Options Exercisable, Potential Dilution	0.20%
$30.00 - $39.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Maximum	$ 39.99
Options outstanding, number of shares	8
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 6 months 1 day
Options Outstanding, Weighted-Average Exercise Prices	$ 36.00
Options Outstanding, Potential Dilution	0.00%
Options exercisable, number of shares	8
Options exercisable, weighted-average exercise prices	$ 36.00
Options Exercisable, Potential Dilution	0.00%
$40.00 - $59.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 40
Range of Exercise Prices, Maximum	$ 59.99
Options outstanding, number of shares	2,271
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	2 years 7 months 18 days
Options Outstanding, Weighted-Average Exercise Prices	$ 51.34
Options Outstanding, Potential Dilution	0.70%
Options exercisable, number of shares	2,272
Options exercisable, weighted-average exercise prices	$ 51.34
Options Exercisable, Potential Dilution	0.70%
$60.00 - $65.93 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 60
Range of Exercise Prices, Maximum	$ 64.92
Options outstanding, number of shares	369
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	10 months
Options Outstanding, Weighted-Average Exercise Prices	$ 64.85
Options Outstanding, Potential Dilution	0.10%
Options exercisable, number of shares	369
Options exercisable, weighted-average exercise prices	$ 64.85
Options Exercisable, Potential Dilution	0.10%
$11.53 - $64.92 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 11.53
Range of Exercise Prices, Maximum	$ 64.92
Options outstanding, number of shares	5,311
Options Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 7 months 1 day
Options Outstanding, Weighted-Average Exercise Prices	$ 37.43
Options Outstanding, Potential Dilution	1.70%
Options exercisable, number of shares	4,191
Options exercisable, weighted-average exercise prices	$ 40.70
Options Exercisable, Potential Dilution	1.30%