Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2025	Jan. 31, 2025
Marketable Securities [Line Items]
Amortized Cost	$ 6,544,833	$ 6,436,471
Gross Unrealized Gains	20,649	12,170
Gross Unrealized Losses	(1,506)	(6,312)
Estimated Fair Value	6,563,976	6,442,329
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	2,930	20,841
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	2,930	20,841
Agency bonds
Marketable Securities [Line Items]
Amortized Cost	996,220	1,173,518
Gross Unrealized Gains	1,691	1,609
Gross Unrealized Losses	(323)	(643)
Estimated Fair Value	997,588	1,174,484
Corporate and other debt securities
Marketable Securities [Line Items]
Amortized Cost	745,550	719,145
Gross Unrealized Gains	2,606	2,069
Gross Unrealized Losses	(131)	(419)
Estimated Fair Value	748,025	720,795
U.S. government agency securities
Marketable Securities [Line Items]
Amortized Cost	4,717,606	4,412,730
Gross Unrealized Gains	16,351	8,449
Gross Unrealized Losses	(1,043)	(5,249)
Estimated Fair Value	4,732,914	4,415,930
Treasury bills
Marketable Securities [Line Items]
Amortized Cost	82,527	110,237
Gross Unrealized Gains	1	43
Gross Unrealized Losses	(9)	(1)
Estimated Fair Value	$ 82,519	$ 110,279

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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