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Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Jan. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,978,660	$ 4,764,845
Unrealized Gains	660	1,694
Unrealized Losses	(32,529)	(17,359)
Aggregate Fair Value	5,946,791	4,749,180
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	659,919	594,864
Unrealized Gains	0	0
Unrealized Losses	0	(1)
Aggregate Fair Value	659,919	594,863
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,318,741	4,169,980
Unrealized Gains	660	1,694
Unrealized Losses	(32,529)	(17,357)
Aggregate Fair Value	5,286,872	4,154,317
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,307,535	2,455,739
Unrealized Gains	51	77
Unrealized Losses	(9,121)	(6,765)
Aggregate Fair Value	2,298,465	2,449,051
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	787,767	325,664
Unrealized Gains	254	0
Unrealized Losses	(2,376)	(3,874)
Aggregate Fair Value	785,645	321,790
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,771,472	966,801
Unrealized Gains	355	1,617
Unrealized Losses	(21,031)	(6,715)
Aggregate Fair Value	1,750,796	961,703
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,111,886	1,016,641
Unrealized Gains	0	0
Unrealized Losses	(1)	(5)
Aggregate Fair Value	$ 1,111,885	$ 1,016,636

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