Net Income Per Share and Weighted Average Shares (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jan. 29, 2021	Oct. 30, 2020	Jan. 31, 2020	Nov. 01, 2019	Jan. 29, 2021	Jan. 31, 2020
Net Income Per Share and Weighted Average Shares [Abstract]
Net income per share numerator	$ 14,000	$ 170,680	$ 61,168	$ 43,223	$ 184,680	$ 104,391
Net income per share denominator [Abstract]
Weighted average shares (in shares)	23,723,395		23,950,811		23,715,573	23,994,583
Add potential dilution [Abstract]
Nonvested stock awards and units (in shares)	61,979		55,006		62,729	60,287
Diluted weighted average shares (in shares)	23,785,374		24,005,817		23,778,302	24,054,870