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	$ (848,411)	$ (266,332)	$ (208,913)
Net change in unrealized gains or losses on available-for-sale securities	(13,713)	779	1,220
Foreign currency translation adjustments	(3,686)	3,719	(9)
Other comprehensive income (loss)	(17,399)	4,498	1,211
Comprehensive loss	$ (865,810)	$ (261,834)	$ (207,702)