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Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 02, 2018
Oct. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 287,551   $ 267,458
Packet Design, LLC      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 642  
Accounts receivable   1,525  
Prepaid expenses and other   450  
Equipment, furniture and fixtures   31  
Goodwill   20,304  
Accounts payable   (165)  
Accrued liabilities   (657)  
Deferred revenue   (5,176)  
Total purchase consideration   41,054  
Customer relationships and contracts | Packet Design, LLC      
Business Acquisition [Line Items]      
Intangible assets   2,200  
Developed technology | Packet Design, LLC      
Business Acquisition [Line Items]      
Intangible assets   $ 21,900