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 02, 2014	May 03, 2013	May 02, 2014	May 03, 2013
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 28,728	$ 24,602	$ 92,943	$ 82,962
Net income per share denominator [Abstract]
Weighted average shares (in shares)	23,820,309	23,760,589	23,816,841	23,683,133
Add potential dilution [Abstract]
Stock options, nonvested stock awards and MSU Grants	158,165	246,232	141,217	230,093
Diluted weighted average shares (in shares)	23,978,474	24,006,821	23,958,058	23,913,226