Liabilities and Restructuring Charges - Summary of Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 12,105	$ 2,093
Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Liability as of October 31, 2016	5,679
Restructuring charges	12,105
Cash (payments)	(4,899)
As of January 31, 2017	$ 12,885