Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 28, 2012	Jul. 30, 2011	Jul. 28, 2012	Jul. 30, 2011	Jan. 28, 2011
Stock-Based Compensation (Textual) [Abstract]
Total fair value of shares vested	$ 1,400,000		$ 1,400,000
Stock-based compensation			5,123,000	2,137,000
Stock Based Compensation (Additional Textual) [Abstract]
Aggregate shares of common stock purchase or receive	3,626,000		3,626,000
Description of period used for stock options granted			three or four years
Expiration period			10 years
Percentage to receive options to purchase common stock			19.80%
Recognized compensation expense	3,200,000	1,300,000	5,100,000	2,100,000
Shares available for stock grants	2,377,255		2,377,255
Weighted average fair value of stock options at the grant date	$ 14.35	$ 16.24	$ 13.71	$ 16.23
Intrinsic value of options exercised	700,000	1,700,000	1,000,000	2,100,000
Outstanding vested options exercisable			Jul. 28, 2012
Maximum [Member]
Stock-Based Compensation (Textual) [Abstract]
Period used for stock options granted			4 years
Minimum [Member]
Stock-Based Compensation (Textual) [Abstract]
Period used for stock options granted			3 years
Stock options [Member]
Stock-Based Compensation (Textual) [Abstract]
Unrecognized compensation expense	9,400,000		9,400,000
Weighted-average period			1 year 2 months 19 days
Total fair value of shares vested	1,700,000	600,000	3,400,000	2,200,000
Restricted stock units [Member]
Stock-Based Compensation (Textual) [Abstract]
Period used for stock options granted			3 years
Unrecognized compensation expense	8,000,000		8,000,000
Weighted-average period			1 year 5 months 5 days
Total fair value of shares vested	0		0
Performance-based stock units [Member]
Stock-Based Compensation (Textual) [Abstract]
Period used for stock options granted			3 years
Unrecognized compensation expense	4,000,000		4,000,000
Weighted-average period			1 year 9 months 7 days
Total fair value of shares vested	0	0	0	0
Stock-based compensation	$ 1,200,000		$ 1,400,000		$ 0