Stock-Based Compensation (Summary of Weighted Average Remaining Contractual Life and the Weighted Average Exercise Prices for Stock Options Both Outstanding and Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified			3 Months Ended
	Apr. 30, 2011	Jan. 29, 2011	Apr. 30, 2011 $11.71 to $24.47 Exercise Price Range [Member]	Apr. 30, 2011 $24.54 to $27.81 Exercise Price Range [Member]	Apr. 30, 2011 $27.84 to $29.42 Exercise Price Range [Member]	Apr. 30, 2011 $29.60 to $32.85 Exercise Price Range [Member]	Apr. 30, 2011 $11.71 to $32.85 Exercise Price Range [Member]
Low exercise price range			$ 11.71	$ 24.54	$ 27.84	$ 29.60	$ 11.71
High exercise price range			$ 24.47	$ 27.81	$ 29.42	$ 32.85	$ 32.85
Options outstanding, number of shares	1,436	1,609	466	404	475	91	1,436
Options outstanding, weighted average remaining contractual life (in years)	3.34		1.97	4.16	3.63	5.25	3.34
Options outstanding, weighted average exercise price	$ 25.88	$ 25.53	$ 20.77	$ 27.04	$ 28.84	$ 31.41	$ 25.88
Options exercisable, number of shares			466	404	475	91	1,436
Options exercisable, weighted average exercise price			$ 20.77	$ 27.04	$ 28.84	$ 31.41	$ 25.88