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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, 2016
Jan. 31, 2015
Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
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, Number of Shares [Roll Forward]      
Shares, Outstanding at January 31, 2015 547,689    
Shares, Vested (265,837)    
Shares, Canceled (61,062)    
Shares, Outstanding at January 31, 2016 496,329 547,689  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Weighted-average grant date fair value, Outstanding at January 31, 2015 $ 59.45    
Weighted-average grant date fair value, Granted 59.30 $ 61.06  
Weighted-average grant date fair value, Vested 57.84    
Weighted-average grant date fair value, Canceled 59.40    
Weighted-average grant date fair value, Outstanding at January 31, 2016 $ 60.28 $ 59.45  
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 15.4 $ 8.1 $ 12.9
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Shares, Granted 275,539 455,806