Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Jan. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 475,257	$ 358,335
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(476)	(619)
Estimated Fair Value	474,781	357,716
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	63,814	62,470
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	63,814	62,470
Treasury bills and U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	370,011	234,848
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(379)	(308)
Estimated Fair Value	369,632	234,540
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,968	46,684
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(35)	(198)
Estimated Fair Value	24,933	46,486
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,767	6,374
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(36)	(66)
Estimated Fair Value	3,731	6,308
Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,697	7,959
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26)	(47)
Estimated Fair Value	$ 12,671	7,912
Cash and cash equivalents | Treasury bills
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		10,000
Estimated Fair Value		$ 10,000