Net Income Per Share and Weighted Average Shares (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 29, 2016	May. 01, 2015	Apr. 29, 2016	May. 01, 2015
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 49,169	$ 35,317	$ 138,276	$ 116,504
Net income per share denominator [Abstract]
Weighted average shares (in shares)	23,941,188	23,937,844	23,945,184	23,904,945
Add potential dilution [Abstract]
Stock options, nonvested stock awards and MSU Grants (in shares)	132,590	128,217	119,440	128,351
Diluted weighted average shares (in shares)	24,073,778	24,066,061	24,064,624	24,033,296