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Employee Benefit Plans (Schedule Of Restricted Stock Units Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value      
Weighted-average grant date fair value, Outstanding at January 31, 2016 $ 60.28    
Weighted-average grant date fair value, Granted 78.42 $ 59.30 $ 61.06
Weighted-average grant date fair value, Vested 60.73    
Weighted-average grant date fair value, Canceled 66.65    
Weighted-average grant date fair value, Outstanding at January 31, 2017 $ 68.11 $ 60.28  
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 11.4 $ 15.4 $ 8.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Shares, Outstanding at January 31, 2016 496,329    
Shares, Granted 240,658 [1] 275,539 455,806
Shares, Vested (187,133)    
Shares, Canceled (44,772)    
Shares, Outstanding at January 31, 2017 505,082 496,329  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares      
Shares, Granted 18,563    
[1] (a) Includes 18,563 shares of performance-based restricted stock units, which assumes maximum achievement.