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Income Taxes - Reconciliation of Effective Tax Rate to the Statutory Federal Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Income Tax Disclosure [Abstract]
Tax at federal statutory rate, amount	$ 6,473	$ 14,752	$ 4,481
Tax at federal statutory rate, percent	21.00%	27.00%	35.00%
State taxes, net of federal effect, amount	$ (1,068)	$ (755)	$ 1,270
State taxes, net of federal effect, percent	(3.50%)	(1.40%)	9.90%
Remeasurement of preferred stock warrant liability, amount	$ 0	$ (2,881)	$ 6,608
Remeasurement of preferred stock warrant liability, percent	0.00%	(5.30%)	51.60%
Stock-based compensation, amount	$ (7,114)	$ (5,454)	$ 229
Stock-based compensation, percent	(23.10%)	(9.90%)	1.80%
Tax Act impact, amount	$ 0	$ 6,670	$ 0
Tax Act impact, percent	0.00%	12.20%	0.00%
Research and development credits, amount	$ (5,984)	$ (2,146)	$ 0
Research and development credits, percent	(19.40%)	(3.90%)	(0.00%)
Uncertain tax positions, amount	$ 2,030	$ 2,846	$ 23
Uncertain tax positions, percent	6.60%	5.10%	0.20%
Return to provision, amount	$ (1,821)	$ (3,891)	$ 0
Return to provision, percent	(5.90%)	(7.10%)	0.00%
Nondeductible compensation, amount	$ 765	$ 652	$ 1,188
Nondeductible compensation, percent	2.50%	1.20%	9.30%
Other, amount	$ 659	$ 20	$ (404)
Other, percent	2.10%	0.00%	(3.20%)
Provision (benefit) for income taxes	$ (6,060)	$ 9,813	$ 13,395
Effective tax rate, percent	(19.70%)	17.90%	104.60%

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