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. 01, 2014	May 02, 2014	Jan. 31, 2014	Nov. 01, 2013	Aug. 02, 2013	May 03, 2013	Feb. 01, 2013	Nov. 02, 2012	Aug. 01, 2014	Aug. 02, 2013	Aug. 03, 2012
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 39,185	$ 28,728	$ 37,055	$ 27,160	$ 34,303	$ 24,602	$ 35,168	$ 23,192	$ 132,128	$ 117,265	$ 103,081
Net income per share denominator [Abstract]
Basic weighted average shares outstanding (in shares)									23,817,768	23,708,875	23,067,566
Add potential dilution [Abstract]
Stock options, nonvested stock awards and MSU Grants (in shares)									148,247	239,446	340,560
Diluted weighted average shares outstanding (in shares)									23,966,015	23,948,321	23,408,126