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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,839,775	$ 2,569,269
Unrealized Gains	91	1,654
Unrealized Losses	(1,121)	(73)
Aggregate Fair Value	2,838,745	2,570,850
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	715,486	440,678
Unrealized Gains	1	0
Unrealized Losses	(2)	0
Aggregate Fair Value	715,485	440,678
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,124,289	2,128,591
Unrealized Gains	90	1,654
Unrealized Losses	(1,119)	(73)
Aggregate Fair Value	2,123,260	2,130,172
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,246,777	1,054,146
Unrealized Gains	54	205
Unrealized Losses	(294)	(10)
Aggregate Fair Value	1,246,537	1,054,341
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	232,209	504,298
Unrealized Gains	2	196
Unrealized Losses	(383)	(49)
Aggregate Fair Value	231,828	504,445
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	426,074	346,563
Unrealized Gains	35	1,253
Unrealized Losses	(444)	(14)
Aggregate Fair Value	425,665	347,802
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	934,715	664,262
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	$ 934,715	$ 664,262

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