Cash Equivalents, Investments and Strategic Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025
Cash equivalents:
Amortized Cost	$ 1,499,303	$ 2,251,048
Gross Unrealized Gains	0	92
Gross Unrealized Losses	(5)	0
Estimated Fair Value	1,499,298	2,251,140
Investments:
Amortized Cost	2,718,799	2,664,694
Gross Unrealized Gains	2,113	2,944
Gross Unrealized Losses	(2,020)	(2,289)
Estimated Fair Value	2,718,892	2,665,349
Amortized Cost	4,218,102	4,915,742
Gross Unrealized Gains	2,113	3,036
Gross Unrealized Losses	(2,025)	(2,289)
Estimated Fair Value	4,218,190	4,916,489
Corporate notes and bonds
Investments:
Amortized Cost	1,893,404	1,559,893
Gross Unrealized Gains	1,850	2,177
Gross Unrealized Losses	(1,189)	(1,520)
Estimated Fair Value	1,894,065	1,560,550
U.S. government and agency securities
Investments:
Amortized Cost	572,230	609,937
Gross Unrealized Gains	214	528
Gross Unrealized Losses	(656)	(727)
Estimated Fair Value	571,788	609,738
Commercial paper
Investments:
Amortized Cost	135,245	307,752
Gross Unrealized Gains	7	142
Gross Unrealized Losses	(161)	(38)
Estimated Fair Value	135,091	307,856
Certificates of deposit
Investments:
Amortized Cost	117,920	187,112
Gross Unrealized Gains	42	97
Gross Unrealized Losses	(14)	(4)
Estimated Fair Value	117,948	187,205
Money market funds
Cash equivalents:
Amortized Cost	1,320,540	1,741,089
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,320,540	1,741,089
Time deposits
Cash equivalents:
Amortized Cost	115,074	113,851
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	115,074	113,851
U.S. government securities
Cash equivalents:
Amortized Cost	52,853	388,578
Gross Unrealized Gains	0	92
Gross Unrealized Losses	(3)	0
Estimated Fair Value	52,850	388,670
Corporate notes and bonds
Cash equivalents:
Amortized Cost	10,836	4,466
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Estimated Fair Value	$ 10,834	4,466
Commercial paper
Cash equivalents:
Amortized Cost		3,064
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 3,064