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Fair Value Measurements - Fair Value of Available-for-sale Securities (Details) - USD ($) $ in Thousands	May 02, 2020	Aug. 03, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 229,944	$ 196,124
Gross Unrealized Gains	1,728	524
Gross Unrealized Losses	(9)	0
Fair Value	231,663	196,648
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	69,644	49,807
Gross Unrealized Gains	713	100
Gross Unrealized Losses	(5)	0
Fair Value	70,352	49,907
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	31,154	29,761
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	31,154	29,761
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,513	42,587
Gross Unrealized Gains	397	145
Gross Unrealized Losses	0	0
Fair Value	46,910	42,732
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	82,633	73,969
Gross Unrealized Gains	618	279
Gross Unrealized Losses	(4)	0
Fair Value	$ 83,247	$ 74,248

X

- Definition

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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