Cash Equivalents, Investments and Strategic Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Apr. 30, 2025	Jan. 31, 2025
Cash equivalents:
Amortized Cost	$ 1,891,347	$ 2,251,048
Gross Unrealized Gains	0	92
Gross Unrealized Losses	(5)	0
Estimated Fair Value	1,891,342	2,251,140
Investments:
Amortized Cost	2,620,765	2,664,694
Gross Unrealized Gains	4,287	2,944
Gross Unrealized Losses	(1,307)	(2,289)
Estimated Fair Value	2,623,745	2,665,349
Amortized Cost	4,512,112	4,915,742
Gross Unrealized Gains	4,287	3,036
Gross Unrealized Losses	(1,312)	(2,289)
Estimated Fair Value	4,515,087	4,916,489
Corporate notes and bonds
Investments:
Amortized Cost	1,824,976	1,559,893
Gross Unrealized Gains	3,174	2,177
Gross Unrealized Losses	(968)	(1,520)
Estimated Fair Value	1,827,182	1,560,550
U.S. government and agency securities
Investments:
Amortized Cost	527,615	609,937
Gross Unrealized Gains	1,003	528
Gross Unrealized Losses	(124)	(727)
Estimated Fair Value	528,494	609,738
Commercial paper
Investments:
Amortized Cost	160,640	307,752
Gross Unrealized Gains	42	142
Gross Unrealized Losses	(211)	(38)
Estimated Fair Value	160,471	307,856
Certificates of deposit
Investments:
Amortized Cost	107,534	187,112
Gross Unrealized Gains	68	97
Gross Unrealized Losses	(4)	(4)
Estimated Fair Value	107,598	187,205
Money market funds
Cash equivalents:
Amortized Cost	1,744,732	1,741,089
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,744,732	1,741,089
Time deposits
Cash equivalents:
Amortized Cost	108,022	113,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	108,022	113,851
Corporate notes and bonds
Cash equivalents:
Amortized Cost	30,646	4,466
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	0
Estimated Fair Value	30,641	4,466
U.S. government securities
Cash equivalents:
Amortized Cost	7,947	388,578
Gross Unrealized Gains	0	92
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 7,947	388,670
Commercial paper
Cash equivalents:
Amortized Cost		3,064
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 3,064