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Fair Value Measurements - Unrealized Loss on Investments (Details) - USD ($) $ in Thousands	Jan. 27, 2024	Jul. 29, 2023
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	$ 0	$ 265
Available-for-sale, unrealized losses, less than 12 months	0	(1)
Available-for-sale, fair value, more than 12 months	2,049	17,896
Available-for-sale, unrealized losses, more than 12 months	(2)	(173)
Available-for-sale, fair value, total	2,049	18,161
Available-for-sale, unrealized losses, total	(2)	(174)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months		265
Available-for-sale, unrealized losses, less than 12 months		(1)
Available-for-sale, fair value, more than 12 months		6,961
Available-for-sale, unrealized losses, more than 12 months		(39)
Available-for-sale, fair value, total		7,226
Available-for-sale, unrealized losses, total		(40)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, fair value, less than 12 months	0	0
Available-for-sale, unrealized losses, less than 12 months	0	0
Available-for-sale, fair value, more than 12 months	2,049	10,935
Available-for-sale, unrealized losses, more than 12 months	(2)	(134)
Available-for-sale, fair value, total	2,049	10,935
Available-for-sale, unrealized losses, total	$ (2)	$ (134)

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