(Summary Of Outstanding And Exercisable Stock Options) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 4,920 5,311
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 5 years 4 months 29 days  
Options Outstanding, Weighted-Average Exercise Prices $ 37.44 $ 37.43
Options exercisable, number of shares 3,006  
Options exercisable, weighted-average exercise prices $ 40.90  
Eleven Point Five Three To Twenty Three Point Eight Three [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 752  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 4 years 5 months 25 days  
Options Outstanding, Weighted-Average Exercise Prices $ 19.17  
Options Outstanding, Potential Dilution 0.20%  
Options exercisable, number of shares 713  
Options exercisable, weighted-average exercise prices $ 19.32  
Options Exercisable, Potential Dilution 0.20%  
Twenty Six Point Two Five To Twenty Six Point Two Five [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 1,000  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 8 years 7 months 4 days  
Options Outstanding, Weighted-Average Exercise Prices $ 26.25  
Options Outstanding, Potential Dilution 0.30%  
Options exercisable, number of shares 320  
Options exercisable, weighted-average exercise prices $ 26.25  
Options Exercisable, Potential Dilution 0.10%  
Twenty Seven Point Four Nine To Thirty Five Point Seven Zero [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 998  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 9 years 2 months 4 days  
Options Outstanding, Weighted-Average Exercise Prices $ 35.43  
Options Outstanding, Potential Dilution 0.30%  
Options exercisable, number of shares 9  
Options exercisable, weighted-average exercise prices $ 27.49  
Options Exercisable, Potential Dilution 0.00%  
Thirty Six To Forty Nine Point Nine Zero [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 1,242  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 3 years 3 months 21 days  
Options Outstanding, Weighted-Average Exercise Prices $ 47.18  
Options Outstanding, Potential Dilution 0.40%  
Options exercisable, number of shares 1,036  
Options exercisable, weighted-average exercise prices $ 49.19  
Options Exercisable, Potential Dilution 0.30%  
Forty Nine Point Nine Six To Sixty Point Five Nine [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 928  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 1 year 5 months 22 days  
Options Outstanding, Weighted-Average Exercise Prices $ 53.41  
Options Outstanding, Potential Dilution 0.30%  
Options exercisable, number of shares 928  
Options exercisable, weighted-average exercise prices $ 53.41  
Options Exercisable, Potential Dilution 0.30%  
Eleven Point Five Three To Sixty Point Five Nine [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding, number of shares 4,920  
Options Outstanding, Weighted-Average Remaining Contractual Term (in years) 5 years 4 months 27 days  
Options Outstanding, Weighted-Average Exercise Prices $ 37.44  
Options Outstanding, Potential Dilution 1.50%  
Options exercisable, number of shares 3,006  
Options exercisable, weighted-average exercise prices $ 40.90  
Options Exercisable, Potential Dilution 0.90%