CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2021	Apr. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (14,573)	$ (25,550)
Other comprehensive income (loss)
Changes in foreign currency translation adjustment	[1]	273	(152)
Changes in unrealized loss on cash flow hedge	[1]	294	(1,180)
Other comprehensive income (loss)		567	(1,332)
Comprehensive loss		$ (14,006)	$ (26,882)

[1] Tax effect was not material