Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Feb. 06, 2022	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 947,073
Cash Equivalents	18,931	$ 54,780
Marketable securities	947,073	916,388
Restricted Cash	10,544	10,544
Amortized Cost	953,828	922,507
Total gross unrealized gains	1,093	9,255
Total gross unrealized losses	(7,648)	(34)
Total fair value	976,548	981,712
Fair Value, Less then 12 months	637,548	41,297
Unrealized Loss, Less then 12 months	(7,625)	(34)
Fair Value Greater then 12 months	1,182	0
Unrealized Loss, Greater then 12 months	(23)	0
U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	193,359	8,301
Unrealized Loss, Less then 12 months	(2,176)	(1)
Fair Value Greater then 12 months	0	0
Unrealized Loss, Greater then 12 months	0	0
U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	24,388
Unrealized Loss, Less then 12 months	(193)
Fair Value Greater then 12 months	0
Unrealized Loss, Greater then 12 months	0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	374,223	32,996
Unrealized Loss, Less then 12 months	(4,708)	(33)
Fair Value Greater then 12 months	1,182	0
Unrealized Loss, Greater then 12 months	(23)	0
Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	4,098
Unrealized Loss, Less then 12 months	(17)
Fair Value Greater then 12 months	0
Unrealized Loss, Greater then 12 months	0
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	37,608
Unrealized Loss, Less then 12 months	(453)
Fair Value Greater then 12 months	0
Unrealized Loss, Greater then 12 months	0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less then 12 months	3,872
Unrealized Loss, Less then 12 months	(78)
Fair Value Greater then 12 months	0
Unrealized Loss, Greater then 12 months	0
Level 1 | Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	29,275	49,984
Cash Equivalents	18,731	39,440
Marketable securities	0	0
Restricted Cash	10,544	10,544
Level 2 | U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	336,303	339,253
Gross Unrealized Gains	512	3,241
Gross Unrealized Losses	(2,176)	(1)
Fair Value	334,639	342,493
Cash Equivalents	0	15,340
Marketable securities	334,639	327,153
Restricted Cash	0	0
Level 2 | U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49,153	56,729
Gross Unrealized Gains	49	516
Gross Unrealized Losses	(193)	0
Fair Value	49,009	57,245
Cash Equivalents	0	0
Marketable securities	49,009	57,245
Restricted Cash	0	0
Level 2 | Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	491,728	425,115
Gross Unrealized Gains	384	4,176
Gross Unrealized Losses	(4,731)	(33)
Fair Value	487,381	429,258
Cash Equivalents	200	0
Marketable securities	487,181	429,258
Restricted Cash	0	0
Level 2 | Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,333	21,486
Gross Unrealized Gains	37	307
Gross Unrealized Losses	(17)	0
Fair Value	12,353	21,793
Cash Equivalents	0	0
Marketable securities	12,353	21,793
Restricted Cash	0	0
Level 2 | Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60,361	79,924
Gross Unrealized Gains	111	1,015
Gross Unrealized Losses	(453)	0
Fair Value	60,019	80,939
Cash Equivalents	0	0
Marketable securities	60,019	80,939
Restricted Cash	0	$ 0
Level 2 | Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,950
Gross Unrealized Gains	0
Gross Unrealized Losses	(78)
Fair Value	3,872
Cash Equivalents
Marketable securities	3,872
Restricted Cash	$ 0