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	$ (679,948)	$ (539,102)	$ (348,535)
Other comprehensive income (loss):
Foreign currency translation adjustments	(918)	118	0
Net change in unrealized gains or losses on available-for-sale debt securities	(15,807)	105	200
Total other comprehensive income (loss)	(16,725)	223	200
Comprehensive loss	$ (696,673)	$ (538,879)	$ (348,335)