Cash, Cash Equivalents and Short-Term Investments - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Jan. 31, 2023
Cash and Cash Equivalents [Abstract]
Interest and investment income	$ 7,300,000	$ 500,000
Net amortization of premiums or discounts on short-term investments	3,596,000	$ 0
Debt securities in a continuous unrealized loss position for more than 12 months	$ 1,000,000		$ 0