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 01, 2015	May 02, 2014	May 01, 2015	May 02, 2014
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 35,317	$ 28,728	$ 116,504	$ 92,943
Net income per share denominator [Abstract]
Weighted average shares (in shares)	23,937,844	23,820,309	23,904,945	23,816,841
Add potential dilution [Abstract]
Stock options, nonvested stock awards and MSU Grants (in shares)	128,217	158,165	128,351	141,217
Diluted weighted average shares (in shares)	24,066,061	23,978,474	24,033,296	23,958,058