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Business Combinations - Schedule of Acquisition Purchase Price (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 11, 2017
Jan. 31, 2018
Oct. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 3,130,598 $ 2,706,974
Black Duck Software      
Business Acquisition [Line Items]      
Cash paid $ 563,500    
Fair value of assumed equity awards allocated to purchase consideration 1,588 1,600  
Total consideration 565,088    
Goodwill 396,914 396,900  
Identifiable intangibles assets acquired 178,000 $ 178,000  
Cash, cash equivalents and short-term investments 19,491    
Other tangible liabilities acquired, net (13,817)    
Deferred revenue (15,500)    
Total purchase allocation $ 565,088