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Liabilities and Restructuring Charges - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Oct. 31, 2018
Restructuring Cost and Reserve [Line Items]          
Restructuring $ 19,338 $ 23 $ 33,746 $ 1,917  
Employee Severance and Benefits          
Restructuring Cost and Reserve [Line Items]          
Restructuring 19,300   33,700 1,900  
Employee related restructuring liabilities 20,800   20,800   $ 8,100
Minimum | Employee Severance and Benefits          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 43,000 8,000 43,000 8,000  
Maximum | Employee Severance and Benefits          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost $ 65,000 $ 10,000 $ 65,000 $ 10,000