Income Taxes - Components of the Provision for Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 03, 2019
Current:
Federal	$ (49,552)	$ (5,528)	$ (221)
State	(2,562)	1,768	2,431
Foreign	(191)	275	(67)
Total current	(52,305)	(3,485)	2,143
Deferred:
Federal	0	17,367	(5,464)
State	0	5,773	(2,667)
Foreign	64	(260)	(72)
Total deferred	64	22,880	(8,203)
Provision (benefit) for income taxes	$ (52,241)	$ 19,395	$ (6,060)