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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Jun. 01, 2017
May 31, 2019
Nov. 30, 2018
[1]
Business Acquisition [Line Items]      
Goodwill   $ 432,623 $ 314,992
Ipswitch      
Business Acquisition [Line Items]      
Net working capital $ 6,068    
Property, plant and equipment 4,661    
Deferred revenue (12,696)    
Goodwill 117,651    
Net assets acquired 225,298    
Purchased technology | Ipswitch      
Business Acquisition [Line Items]      
Finite-lived intangible assets $ 33,100    
Finite-lived intangible assets, useful life 5 years    
Trade name | Ipswitch      
Business Acquisition [Line Items]      
Finite-lived intangible assets $ 9,600    
Finite-lived intangible assets, useful life 5 years    
Customer relationships | Ipswitch      
Business Acquisition [Line Items]      
Finite-lived intangible assets $ 66,600    
Other assets $ 314    
Finite-lived intangible assets, useful life 5 years    
[1] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.