Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2023	Jul. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (89,538)	$ (96,306)	$ (196,407)	$ (186,140)
Other comprehensive income (loss):
Change in unrealized losses on investments	(3,358)	(1,230)	(2,604)	(2,467)
Total comprehensive loss	$ (92,896)	$ (97,536)	$ (199,011)	$ (188,607)