Net Income Per Share and Weighted Average Shares (Details) (USD $) In Thousands, except 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		Apr. 27, 2012	Jan. 27, 2012	Oct. 28, 2011	Aug. 02, 2013	Aug. 03, 2012	Jul. 29, 2011
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 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 denominator: [Abstract]
Basic weighted average shares outstanding (in shares)										23,708,875	23,067,566	22,998,200
Add potential dilution: [Abstract]
Stock options and nonvested stock and stock awards and MSU Grants (in shares)										239,446	340,560	636,475
Diluted weighted average shares outstanding (in shares)										23,948,321	23,408,126	23,634,675

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