CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019	[1]
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (43,433)	$ (144,348)	$ (134,612)
Other comprehensive loss:
Changes in foreign currency translation adjustment	[2]	411	(124)	(265)
Changes in unrealized loss on cash flow hedge	[2]	(1,042)	(206)
Other comprehensive loss:		(631)	(330)	(265)
Comprehensive loss		$ (44,064)	$ (144,678)	$ (134,877)

[1] As reported and disclosed under ASC Topic 840

[2] Tax effect was not material