Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Aug. 02, 2013	May 03, 2013	Feb. 01, 2013	Nov. 02, 2012	Aug. 03, 2012 Week	Aug. 03, 2012		Apr. 27, 2012	Jan. 27, 2012	Oct. 28, 2011	Aug. 02, 2013	Aug. 03, 2012	Jul. 29, 2011
Quarterly Financial Data (Unaudited) [Abstract]
Total revenue	$ 674,101	$ 640,407	$ 702,671	$ 627,451		$ 700,010	[1]	$ 608,514	$ 673,234	$ 598,437	$ 2,644,630	$ 2,580,195	$ 2,434,435
Gross profit	463,444	438,425	458,484	429,593		483,839	[1]	418,899	437,843	412,130	1,789,946	1,752,711	1,661,964
Income before income taxes	50,304	33,978	46,904	34,596		48,552	[1]	27,935	36,312	33,489	165,782	146,288	115,691
Net income	$ 34,303	$ 24,602	$ 35,168	$ 23,192		$ 34,696	[1]	$ 18,974	$ 25,609	$ 23,802	$ 117,265	$ 103,081	$ 85,208
Net income per share - basic (in dollars per share)	$ 1.44	$ 1.04	$ 1.48	$ 0.98		$ 1.49	[1]	$ 0.82	$ 1.11	$ 1.04	$ 4.95	$ 4.47	$ 3.70
Net income per share - diluted (in dollars per share)	$ 1.43	$ 1.02	$ 1.47	$ 0.97		$ 1.47	[1]	$ 0.81	$ 1.10	$ 1.03	$ 4.90	$ 4.40	$ 3.61
Number of weeks in the fourth quarter					14

[1] The Company's fourth quarter of 2012 consisted of 14 weeks.