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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,438,958	$ 2,569,269
Unrealized Gains	548	1,654
Unrealized Losses	(73)	(73)
Aggregate Fair Value	2,439,433	2,570,850
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	359,551	440,678
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	359,551	440,678
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,079,407	2,128,591
Unrealized Gains	548	1,654
Unrealized Losses	(73)	(73)
Aggregate Fair Value	2,079,882	2,130,172
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,096,642	1,054,146
Unrealized Gains	207	205
Unrealized Losses	(37)	(10)
Aggregate Fair Value	1,096,812	1,054,341
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	189,188	504,298
Unrealized Gains	66	196
Unrealized Losses	0	(49)
Aggregate Fair Value	189,254	504,445
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	372,240	346,563
Unrealized Gains	275	1,253
Unrealized Losses	(36)	(14)
Aggregate Fair Value	372,479	347,802
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	780,888	664,262
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	$ 780,888	$ 664,262

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