Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Apr. 29, 2023	Jul. 30, 2022
Debt Securities, Available-for-sale [Line Items]
One Year or Less	$ 50,139	$ 82,049
Over One Year Through Five Years	0	17,713
Over Five Years	0	0
Total	50,139	99,762
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
One Year or Less	30,371	35,473
Over One Year Through Five Years	0	6,787
Over Five Years	0	0
Total	30,371	42,260
Commercial paper
Debt Securities, Available-for-sale [Line Items]
One Year or Less	0	2,985
Over One Year Through Five Years	0	0
Over Five Years	0	0
Total	0	2,985
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
One Year or Less	19,768	43,591
Over One Year Through Five Years	0	10,926
Over Five Years	0	0
Total	$ 19,768	$ 54,517