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	$ (63,248)	$ (209,712)	$ (259,668)	$ (514,034)
Other comprehensive income (loss):
Net unrealized gain (loss) on investments (net of tax)	1,751	(3,827)	4,647	(6,541)
Total other comprehensive income (loss)	1,751	(3,827)	4,647	(6,541)
Comprehensive loss	$ (61,497)	$ (213,539)	$ (255,021)	$ (520,575)