CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (154,856)	$ (168,889)	$ (547,795)	$ (340,167)
Other comprehensive income (loss):
Foreign currency translation adjustments	(361)	0	(63)	0
Net change in unrealized gains or losses on available-for-sale securities	(4,266)	(771)	(3,862)	159
Total other comprehensive income (loss)	(4,627)	(771)	(3,925)	159
Comprehensive loss	$ (159,483)	$ (169,660)	$ (551,720)	$ (340,008)