Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative effect of adopting accounting standards	[1]	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Cumulative effect of adopting accounting standards	[1]
Stockholders' equity, beginning balance (in shares) at Jul. 28, 2018				98,799,861
Stockholders' equity, beginning balance at Jul. 28, 2018	$ 315,072	$ 35		$ 2	$ 235,312	$ 0	$ 79,758	$ 35
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)				2,200,393
Issuance of common stock upon exercise of stock options	13,693				13,693
Issuance of restricted stock units, net of tax withholdings (in shares)				397,226
Issuance of restricted stock units, net of tax withholdings	(6,748)				(6,748)
Vesting of early exercised options	209				209
Stock-based compensation	37,045				37,045
Net income (loss)	36,881						36,881
Total other comprehensive income (loss), net of tax	(187)					(187)
Stockholders' equity, ending balance (in shares) at Aug. 03, 2019				101,397,480
Stockholders' equity, ending balance at Aug. 03, 2019	396,000			$ 2	279,511	(187)	116,674
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)				1,278,894
Issuance of common stock upon exercise of stock options	12,078				12,078
Issuance of restricted stock units, net of tax withholdings (in shares)				1,079,133
Issuance of restricted stock units, net of tax withholdings	(12,819)				(12,819)
Stock-based compensation	69,980				69,980
Net income (loss)	(67,117)						(67,117)
Total other comprehensive income (loss), net of tax	2,915					2,915
Stockholders' equity, ending balance (in shares) at Aug. 01, 2020				103,755,507
Stockholders' equity, ending balance at Aug. 01, 2020	401,037			$ 2	348,750	2,728	49,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options, net of early exercised options (in shares)				2,067,751
Issuance of common stock upon exercise of stock options	25,932				25,932
Issuance of restricted stock units, net of tax withholdings (in shares)				2,132,730
Issuance of restricted stock units, net of tax withholdings	(64,316)				(64,316)
Stock-based compensation	106,389				106,389
Net income (loss)	(8,876)						(8,876)
Total other comprehensive income (loss), net of tax	683					683
Stockholders' equity, ending balance (in shares) at Jul. 31, 2021				107,955,988
Stockholders' equity, ending balance at Jul. 31, 2021	$ 460,849			$ 2	$ 416,755	$ 3,411	$ 40,681

[1] See Note 2, Summary of Significant Accounting Policies, of the Notes to the Consolidated Financial Statements for more details on the cumulative effect of adopting accounting standards.