Consolidated Statement of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (15,331)	$ (5,311)	$ (70,251)	$ (42,389)
Foreign currency translation adjustments	(139)	105	(230)	(28)
Total comprehensive loss	$ (15,470)	$ (5,206)	$ (70,481)	$ (42,417)