Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (35,198)	$ (38,284)	$ (67,727)	$ (40,843)
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustment	1,948	(223)	(583)	(386)
Change in unrealized gain (loss) on marketable securities	(15)	31	(12)	46
Change in unrealized gain (loss) on cash flow hedges	(547)	(438)	(770)	(691)
Other comprehensive income (loss)	1,386	(630)	(1,365)	(1,031)
Comprehensive loss	$ (33,812)	$ (38,914)	$ (69,092)	$ (41,874)