CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (93,400)	$ (72,019)	$ (169,564)	$ (280,212)
Other comprehensive loss:
Change in unrealized losses on investments	(675)	(2,720)	(1,938)	(825)
Total comprehensive loss	$ (94,075)	$ (74,739)	$ (171,502)	$ (281,037)