CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (306,866)	$ (266,944)	$ (175,522)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities	(3,464)	(30)	91
Foreign currency translation adjustment	1,240	(899)	308
Other comprehensive income (loss)	(2,224)	(929)	399
Total comprehensive loss	$ (309,090)	$ (267,873)	$ (175,123)