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Employee Benefit Plans (Schedule Of Restricted Stock Units Activity) (Details) (USD $)
12 Months Ended
Jan. 31, 2013
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 568,498
Shares, Granted 305,097
Shares, Vested (227,553)
Shares, Canceled (39,275)
Shares, Outstanding at January 31, 2013 606,767
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 $ 43.74
Weighted-average grant date fair value, Granted $ 52.80
Weighted-average grant date fair value, Vested $ 40.75
Weighted-average grant date fair value, Canceled $ 47.47
Weighted-average grant date fair value, Outstanding at January 31, 2013 $ 49.18