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Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Income Statement [Abstract]      
Revenue, net $ 1,577,558 $ 1,226,505 $ 977,139
Cost of goods sold 874,429 690,483 542,718
Gross profit 703,129 536,022 434,421
Selling, general, and administrative expenses 679,634 492,998 402,781
Operating income 23,495 43,024 31,640
Remeasurement of preferred stock warrant liability 0 (10,685) 18,881
Interest income (5,791) (904) (42)
Other income, net (1,535) (100) 0
Income before income taxes 30,821 54,713 12,801
Provision for income taxes (6,060) 9,813 13,395
Net income (loss) 36,881 44,900 (594)
Other comprehensive income (loss):      
Change in unrealized gain on available-for-sale securities, net of tax 391 0 0
Foreign currency translation (578) 0 0
Total other comprehensive income (loss), net of tax (187) 0 0
Comprehensive income (loss) 36,694 44,900 (594)
Net income (loss) attributable to common stockholders:      
Basic 36,863 35,541 (594)
Diluted $ 36,864 $ 27,285 $ (594)
Earnings (loss) per share attributable to common stockholders:      
Basic (in dollars per share) $ 0.37 $ 0.47 $ (0.02)
Diluted (in dollars per share) $ 0.36 $ 0.34 $ (0.02)
Weighted-average shares used to compute earnings per share attributable to common stockholders:      
Basic (in shares) 100,013,462 75,947,759 24,973,931
Diluted (in shares) 103,653,626 81,288,418 24,973,931