Cash, Cash Equivalents and Short-Term Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022	Jan. 31, 2023
Cash and Cash Equivalents [Abstract]
Interest and investment income	$ 9,100	$ 3,100	$ 16,400	$ 3,600
Net amortization of premiums or discounts on short-term investments	4,900	$ 1,300	8,494	$ 1,293
More than 12 months or greater, carrying value	$ 117,551		$ 117,551		$ 0