Investments - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2022	Jan. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,619,196	$ 2,535,791
Unrealized Gains	19	5
Unrealized Losses	(28,230)	(4,703)
Aggregate Fair Value	4,590,985	2,531,093
Included in Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	757,758	525,524
Unrealized Gains	0	0
Unrealized Losses	(113)	(1)
Aggregate Fair Value	757,645	525,523
Included in Marketable securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,861,438	2,010,267
Unrealized Gains	19	5
Unrealized Losses	(28,117)	(4,702)
Aggregate Fair Value	3,833,340	2,005,570
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,391,963	843,627
Unrealized Gains	1	5
Unrealized Losses	(10,333)	(1,720)
Aggregate Fair Value	2,381,631	841,912
U.S. agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	548,109	232,093
Unrealized Gains	0	0
Unrealized Losses	(6,020)	(1,168)
Aggregate Fair Value	542,089	230,925
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	624,186	490,867
Unrealized Gains	18	0
Unrealized Losses	(11,877)	(1,815)
Aggregate Fair Value	612,327	489,052
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,054,938	969,204
Unrealized Gains	0	0
Unrealized Losses	0	0
Aggregate Fair Value	$ 1,054,938	$ 969,204

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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