Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 29, 2023	Apr. 30, 2022	Apr. 29, 2023	Apr. 30, 2022
Income Statement [Abstract]
Revenue, net	$ 394,914	$ 492,941	$ 1,262,625	$ 1,590,909
Cost of goods sold	227,011	282,851	733,844	875,098
Gross profit	167,903	210,090	528,781	715,811
Selling, general, and administrative expenses	192,650	286,970	675,368	825,239
Operating loss	(24,747)	(76,880)	(146,587)	(109,428)
Interest income	2,609	194	4,088	699
Other income (expense), net	685	(942)	53	(1,096)
Loss before income taxes	(21,453)	(77,628)	(142,446)	(109,825)
Provision for income taxes	372	412	868	954
Net loss	(21,825)	(78,040)	(143,314)	(110,779)
Other comprehensive income (loss):
Change in unrealized gain (loss) on available-for-sale securities, net of tax	732	(1,283)	1,487	(2,252)
Foreign currency translation	519	(2,384)	1,408	(3,835)
Total other comprehensive income (loss), net of tax	1,251	(3,667)	2,895	(6,087)
Comprehensive loss	(20,574)	(81,707)	(140,419)	(116,866)
Net loss attributable to common stockholders:
Basic	(21,825)	(78,040)	(143,314)	(110,779)
Diluted	$ (21,825)	$ (78,040)	$ (143,314)	$ (110,779)
Loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.19)	$ (0.72)	$ (1.26)	$ (1.02)
Diluted (in dollars per share)	$ (0.19)	$ (0.72)	$ (1.26)	$ (1.02)
Weighted-average shares used to compute loss per share attributable to common stockholders:
Basic (in shares)	115,445,285	108,759,202	113,911,089	108,771,065
Diluted (in shares)	115,445,285	108,759,202	113,911,089	108,771,065