Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jan. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,955,421	$ 4,764,845
Unrealized Gains	959	1,694
Unrealized Losses	(28,194)	(17,359)
Aggregate Fair Value	5,928,186	4,749,180
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	763,088	594,864
Unrealized Gains	0	0
Unrealized Losses	(1)	(1)
Aggregate Fair Value	763,087	594,863
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,192,333	4,169,980
Unrealized Gains	959	1,694
Unrealized Losses	(28,193)	(17,357)
Aggregate Fair Value	5,165,099	4,154,317
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,577,707	2,455,739
Unrealized Gains	23	77
Unrealized Losses	(10,470)	(6,765)
Aggregate Fair Value	2,567,260	2,449,051
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	543,065	325,664
Unrealized Gains	283	0
Unrealized Losses	(2,742)	(3,874)
Aggregate Fair Value	540,606	321,790
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,649,860	966,801
Unrealized Gains	652	1,617
Unrealized Losses	(14,982)	(6,715)
Aggregate Fair Value	1,635,530	961,703
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,184,789	1,016,641
Unrealized Gains	1	0
Unrealized Losses	0	(5)
Aggregate Fair Value	$ 1,184,790	$ 1,016,636

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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