Cash Equivalents, Investments and Strategic Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Jan. 31, 2025
Cash equivalents:
Amortized Cost	$ 1,401,089	$ 2,251,048
Gross Unrealized Gains	28	92
Gross Unrealized Losses	(6)	0
Estimated Fair Value	1,401,111	2,251,140
Investments:
Amortized Cost	2,447,778	2,664,694
Gross Unrealized Gains	5,360	2,944
Gross Unrealized Losses	(216)	(2,289)
Estimated Fair Value	2,452,922	2,665,349
Amortized Cost	3,848,867	4,915,742
Gross Unrealized Gains	5,388	3,036
Gross Unrealized Losses	(222)	(2,289)
Estimated Fair Value	3,854,033	4,916,489
Corporate notes and bonds
Investments:
Amortized Cost	1,726,138	1,559,893
Gross Unrealized Gains	4,336	2,177
Gross Unrealized Losses	(151)	(1,520)
Estimated Fair Value	1,730,323	1,560,550
U.S. government and agency securities
Investments:
Amortized Cost	556,171	609,937
Gross Unrealized Gains	888	528
Gross Unrealized Losses	(65)	(727)
Estimated Fair Value	556,994	609,738
Certificates of deposit
Investments:
Amortized Cost	87,485	187,112
Gross Unrealized Gains	83	97
Gross Unrealized Losses	0	(4)
Estimated Fair Value	87,568	187,205
Commercial paper
Investments:
Amortized Cost	77,984	307,752
Gross Unrealized Gains	53	142
Gross Unrealized Losses	0	(38)
Estimated Fair Value	78,037	307,856
Money market funds
Cash equivalents:
Amortized Cost	1,117,544	1,741,089
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,117,544	1,741,089
U.S. government securities
Cash equivalents:
Amortized Cost		388,578
Gross Unrealized Gains		92
Gross Unrealized Losses		0
Estimated Fair Value		388,670
Time deposits
Cash equivalents:
Amortized Cost	116,675	113,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	116,675	113,851
U.S. government and agency securities
Cash equivalents:
Amortized Cost	104,885
Gross Unrealized Gains	23
Gross Unrealized Losses	(1)
Estimated Fair Value	104,907
Commercial paper
Cash equivalents:
Amortized Cost	60,161	3,064
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(5)	0
Estimated Fair Value	60,161	3,064
Corporate notes and bonds
Cash equivalents:
Amortized Cost	1,824	4,466
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 1,824	$ 4,466