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Employee Benefit Plans (Schedule Of Restricted Stock Units Activity) (Details) (USD $)
12 Months Ended
Jan. 31, 2014
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, 2012 606,767
Shares, Vested (277,139)
Shares, Canceled (45,424)
Shares, Outstanding at January 31, 2013 284,204
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, 2012 $ 49.18
Weighted-average grant date fair value, Vested $ 46.49
Weighted-average grant date fair value, Canceled $ 51.37
Weighted-average grant date fair value, Outstanding at January 31, 2013 $ 51.45