Liabilities and Restructuring Charges - Summary of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 12,907	$ 894	$ 25,012	$ 2,987
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Liability as of October 31, 2016			5,679
Restructuring charges	12,900		25,012
Cash (payments)			(18,819)
As of April 30, 2017(1)	$ 11,872		$ 11,872