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Fair Value Measurements - Fair Value of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jan. 30, 2021	Aug. 01, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 228,760	$ 236,491
Gross Unrealized Gains	598	1,649
Gross Unrealized Losses	(6)	(6)
Fair Value	229,352	238,134
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	70,193	67,335
Gross Unrealized Gains	204	516
Gross Unrealized Losses	0	(1)
Fair Value	70,397	67,850
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,350	6,150
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	11,350	6,150
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,987	35,331
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	41,987	35,331
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,832	44,854
Gross Unrealized Gains	118	410
Gross Unrealized Losses	(4)	(4)
Fair Value	22,946	45,260
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	82,398	82,821
Gross Unrealized Gains	276	723
Gross Unrealized Losses	(2)	(1)
Fair Value	$ 82,672	$ 83,543

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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