Investments - Summary Marketable Securities (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Marketable Securities [Line Items]
Amortized Cost	$ 4,392,058	$ 4,380,350
Gross Unrealized Gains	599	35
Gross Unrealized Losses	(66,821)	(23,939)
Estimated Fair Value	4,325,836	4,356,446
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	77,701	28,723
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	77,701	28,723
Agency bonds
Marketable Securities [Line Items]
Amortized Cost	823,027	632,935
Gross Unrealized Gains	63	2
Gross Unrealized Losses	(12,440)	(3,328)
Estimated Fair Value	810,650	629,609
Corporate and other debt securities
Marketable Securities [Line Items]
Amortized Cost	555,354	282,124
Gross Unrealized Gains	385	5
Gross Unrealized Losses	(4,845)	(1,202)
Estimated Fair Value	550,894	280,927
U.S. government agency securities
Marketable Securities [Line Items]
Amortized Cost	2,910,572	3,046,742
Gross Unrealized Gains	150	28
Gross Unrealized Losses	(49,507)	(19,261)
Estimated Fair Value	2,861,215	3,027,509
Treasury bills
Marketable Securities [Line Items]
Amortized Cost	25,404	389,826
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(29)	(148)
Estimated Fair Value	$ 25,376	$ 389,678

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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