Net Income Per Share and Weighted Average Shares (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Aug. 02, 2019	May 03, 2019	Feb. 01, 2019	Nov. 02, 2018	Aug. 03, 2018	[1]	Apr. 27, 2018	Jan. 26, 2018	Oct. 27, 2017	Aug. 02, 2019	Aug. 03, 2018	Jul. 28, 2017
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 65,025	$ 50,414	$ 60,755	$ 47,207	$ 61,354		$ 48,747	$ 91,139	$ 46,380	$ 223,401	$ 247,620	$ 201,899
Net income per share denominator [Abstract]
Basic weighted average shares outstanding (in shares)										24,037,272	24,011,161	24,031,810
Add potential dilution [Abstract]
Nonvested stock awards and units, MSU Grants and stock options (in shares)										59,124	64,453	86,478
Diluted weighted average shares outstanding (in shares)										24,096,396	24,075,614	24,118,288

[1] The Company's fourth quarter of fiscal 2018 consisted of 14 weeks.