Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 03, 2019
Income Statement [Abstract]
Revenue, net	$ 2,101,258	$ 1,711,733	$ 1,577,558
Cost of goods sold	1,153,622	957,523	874,429
Gross profit	947,636	754,210	703,129
Selling, general, and administrative expenses	1,010,997	805,874	679,634
Operating income (loss)	(63,361)	(51,664)	23,495
Interest (income) expense	(2,610)	(5,535)	(5,791)
Other (income) expense, net	366	1,593	(1,535)
Income (loss) before income taxes	(61,117)	(47,722)	30,821
Provision (benefit) for income taxes	(52,241)	19,395	(6,060)
Net income (loss)	(8,876)	(67,117)	36,881
Other comprehensive income (loss):
Change in unrealized gain (loss) on available-for-sale securities, net of tax	(1,503)	822	391
Foreign currency translation	2,186	2,093	(578)
Total other comprehensive income (loss), net of tax	683	2,915	(187)
Comprehensive income (loss)	(8,193)	(64,202)	36,694
Net income (loss) attributable to common stockholders:
Basic	(8,876)	(67,117)	36,863
Diluted	$ (8,876)	$ (67,117)	$ 36,864
Earnings (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.08)	$ (0.66)	$ 0.37
Diluted (in dollars per share)	$ (0.08)	$ (0.66)	$ 0.36
Weighted-average shares used to compute earnings (loss) per share attributable to common stockholders:
Basic (in shares)	105,975,403	102,383,282	100,013,462
Diluted (in shares)	105,975,403	102,383,282	103,653,626