Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Fair Value Disclosures [Abstract]
Upward adjustments	$ 0	$ 1,124	$ 0	$ 1,124
Impairments	(1,000)	(7,482)	(3,101)	(34,037)
Net unrealized gains (losses)	(790)	(6,706)	4,206	(12,183)
Total—included in other expense, net	$ (1,790)	$ (13,064)	$ 1,105	$ (45,096)