Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 29,672	$ 14,443	$ 38,423	$ 14,408
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	86,000		86,000
Restructuring charges	24,700	14,700	30,700	14,700
Employee related restructuring liabilities	30,300	$ 6,800	30,300	$ 6,800	$ 22,600
Involuntary Employee Termination And VRP
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 29,700		$ 38,400