Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (70,304)	$ (98,858)	$ (266,711)	$ (284,998)
Other comprehensive income (loss):
Change in unrealized gains (losses) on investments	1,627	(8,436)	(977)	(10,903)
Total comprehensive loss	$ (68,677)	$ (107,294)	$ (267,688)	$ (295,901)