Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (1,977)	$ 19,338	$ 36,446	$ 33,746
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	84,000		84,000
Restructuring charges	25,000	19,300	55,700	33,700
Employee related restructuring liabilities	3,300	$ 20,800	3,300	$ 20,800	$ 22,600
Involuntary Employee Termination And VRP
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (2,000)		$ 36,400