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	$ (81,293)	$ (72,651)	$ (222,418)	$ (191,143)
Other comprehensive loss, net of tax:
Unrealized gain on available-for-sale securities	(298)	(341)	(350)	(24)
Foreign currency translation adjustment	(714)	(65)	(238)	(538)
Other comprehensive loss	(1,012)	(406)	(588)	(562)
Total comprehensive loss	$ (82,305)	$ (73,057)	$ (223,006)	$ (191,705)