Net Income (Loss) Per Share and Weighted Average Shares (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jul. 31, 2020	[1],[2]	May 01, 2020	[2],[3]	Jan. 31, 2020	Nov. 01, 2019	Aug. 02, 2019	[1],[2]	May 03, 2019	[2],[3]	Feb. 01, 2019	Nov. 02, 2018	Jul. 31, 2020	Aug. 02, 2019	Aug. 03, 2018
Net Income (Loss) Per Share and Weighted Average Shares [Abstract]
Net income (loss) per share numerator	$ 25,066		$ (161,932)		$ 61,168	$ 43,223	$ 65,025		$ 50,414		$ 60,755	$ 47,207	$ (32,475)	$ 223,401	$ 247,620
Net income (loss) per share denominator [Abstract]
Basic weighted average shares outstanding (in shares)													23,865,367	24,037,272	24,011,161
Add potential dilution [Abstract]
Nonvested stock awards and units (in shares)													0	59,124	64,453
Diluted weighted average shares outstanding (in shares)													23,865,367	24,096,396	24,075,614

[1] In the fourth quarter of 2020, the Company completed a sale and leaseback transaction and recorded a gain on the sale and leaseback transaction of $69,954.

[2] The Company’s operating results were adversely affected by the impact of the COVID-19 pandemic.

[3] In the third quarter of 2020, the Company recorded a loss of $132,878, which represented its equity investment in PBS HC and its receivable related to the principal and accumulated interest amounts on PBS HC promissory notes.  See Note 3 for further information regarding the Company’s investment in PBS HC.