Net Income Per Share and Weighted Average Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 03, 2013	Apr. 27, 2012	May 03, 2013	Apr. 27, 2012
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 24,602	$ 18,974	$ 82,962	$ 68,385
Net income per share denominator: [Abstract]
Basic weighted average shares outstanding (in shares)	23,760,589	23,132,730	23,683,133	22,990,544
Add potential dilution: [Abstract]
Stock options and nonvested stock awards and MSU Grants (in shares)	246,232	403,035	230,093	338,686
Diluted weighted average shares outstanding (in shares)	24,006,821	23,535,765	23,913,226	23,329,230