Employee Benefit Plans (Summary Of The Status Of Stock-Based Equity Incentives Outstanding) (Details) (USD $)	12 Months Ended
	Jan. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	502,225
Weighted- average remaining contractual life (years)	3 years
Weighted- average exercise price	$ 33.33
Number exercisable at 1/31/13	354,391
Weighted- average exercise price	$ 37.74
$21.13 – $21.13
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	172,181
Weighted- average remaining contractual life (years)	5 years 10 months 24 days
Weighted- average exercise price	$ 21.13
Number exercisable at 1/31/13	33,079
Weighted- average exercise price	$ 21.13
Lower range of exercise price	$ 21.13
Upper range of exercise price	$ 21.13
24.27 – 33.74
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	23,804
Weighted- average remaining contractual life (years)	7 months 6 days
Weighted- average exercise price	$ 27.94
Number exercisable at 1/31/13	22,866
Weighted- average exercise price	$ 27.79
Lower range of exercise price	$ 24.27
Upper range of exercise price	$ 33.74
37.04 – 37.04
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	49,000
Weighted- average remaining contractual life (years)	2 years
Weighted- average exercise price	$ 37.04
Number exercisable at 1/31/13	49,000
Weighted- average exercise price	$ 37.04
Lower range of exercise price	$ 37.04
Upper range of exercise price	$ 37.04
37.06 – 40.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	32,347
Weighted- average remaining contractual life (years)	2 years 9 months 18 days
Weighted- average exercise price	$ 38.15
Number exercisable at 1/31/13	31,149
Weighted- average exercise price	$ 38.17
Lower range of exercise price	$ 37.06
Upper range of exercise price	$ 40.69
41.08 – 41.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	204,180
Weighted- average remaining contractual life (years)	1 year 2 months 12 days
Weighted- average exercise price	$ 41.08
Number exercisable at 1/31/13	204,180
Weighted- average exercise price	$ 41.08
Lower range of exercise price	$ 41.08
Upper range of exercise price	$ 41.08
41.55 – 45.72
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	11,257
Weighted- average remaining contractual life (years)	1 year 2 months 12 days
Weighted- average exercise price	$ 44.89
Number exercisable at 1/31/13	10,897
Weighted- average exercise price	$ 44.98
Lower range of exercise price	$ 41.55
Upper range of exercise price	$ 45.72
48.79 – 54.03
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding at 1/31/13	9,456
Weighted- average remaining contractual life (years)	6 years 2 months 12 days
Weighted- average exercise price	$ 52.25
Number exercisable at 1/31/13	3,220
Weighted- average exercise price	$ 48.79
Lower range of exercise price	$ 48.79
Upper range of exercise price	$ 54.03