Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Jul. 29, 2023	Jul. 30, 2022	Jul. 31, 2021
Deferred tax assets:
Inventory reserve and UNICAP	$ 16,514	$ 25,867
Accruals and reserves	2,829	5,180
Research and development credits	44,923	35,843
Capitalized research and development costs	31,416	0
Capitalized research and development costs	(31,400)
Stock-based compensation	10,679	16,487
Deferred revenue	1,095	390
Operating lease liability	40,423	43,280
Net operating losses	49,734	52,751
Other	1,996	2,001
Gross deferred tax assets	199,609	181,799
Less: valuation allowance	(154,757)	(126,463)	$ (77,604)
Deferred tax assets, net of valuation allowance	44,852	55,336
Deferred tax liabilities:
Depreciation and amortization	(16,306)	(20,221)
Operating lease right-of-use assets	(27,505)	(33,254)
Other	(561)	(1,110)
Gross deferred tax liabilities	(44,372)	(54,585)
Net deferred tax assets, net of valuation allowance	$ 480	$ 751