CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (5,284)	$ (40,896)	$ (38,490)	$ (113,958)
Other comprehensive income (loss)*:
Changes in foreign currency translation adjustment	[1]	(37)	(7)	135	(83)
Changes in unrealized loss on cash flow hedge	[1]	115	(51)	(1,125)	(51)
Other comprehensive income (loss)		78	(58)	(990)	(134)
Comprehensive loss		$ (5,206)	$ (40,954)	$ (39,480)	$ (114,092)

[1] Tax effect was not material