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Fair Value Measurements - Fair Value of Available-for-sale Securities (Details) $ in Thousands	Aug. 03, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 196,124
Gross Unrealized Gains	524
Gross Unrealized Losses	0
Fair Value	196,648
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,807
Gross Unrealized Gains	100
Gross Unrealized Losses	0
Fair Value	49,907
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,761
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	29,761
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42,587
Gross Unrealized Gains	145
Gross Unrealized Losses	0
Fair Value	42,732
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,969
Gross Unrealized Gains	279
Gross Unrealized Losses	0
Fair Value	$ 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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