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Business Combinations - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 31, 2020
Oct. 31, 2019
[1]
Business Acquisition [Line Items]    
Goodwill $ 3,231,592 $ 3,171,179
Several acquisitions    
Business Acquisition [Line Items]    
Consideration transfered 79,800  
Identifiable intangibles assets acquired 25,200  
Goodwill 56,200  
Several acquisitions | Software Integrity    
Business Acquisition [Line Items]    
Goodwill $ 12,900  
[1]
Derived from audited financial statements.