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Business Combination - Schedule of Acquisition Purchase Price (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 11, 2017
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 3,143,249 $ 2,706,974 $ 2,518,245
Black Duck Software        
Business Acquisition [Line Items]        
Cash paid   563,500    
Fair value of assumed equity awards allocated to purchase consideration   1,588    
Total purchase consideration $ 565,100 565,088    
Goodwill   395,395    
Identifiable intangibles assets acquired   178,000    
Cash, cash equivalents and short-term investments   19,491    
Other tangible liabilities acquired, net   (12,298)    
Deferred revenue   (15,500)    
Total purchase allocation   $ 565,088