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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2019
May 31, 2020
May 31, 2020
Nov. 30, 2019
Business Acquisition [Line Items]        
Goodwill   $ 431,869 $ 431,869 $ 432,824
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Goodwill     $ (838)  
Ipswitch        
Business Acquisition [Line Items]        
Net working capital $ 6,719      
Property, plant and equipment 4,661      
Other assets 310      
Deferred revenue (12,725)      
Goodwill 117,033      
Net assets acquired 225,298      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Net working capital 651      
Other assets (4)      
Deferred revenue (29)      
Goodwill (618) $ (600)    
Net assets acquired 0      
Purchased technology | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 33,100      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Finite-lived intangible assets, useful life 5 years      
Trade name | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 9,600      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Finite-lived intangible assets, useful life 5 years      
Customer relationships | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 66,600      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Finite-lived intangible assets, useful life 5 years      
Previously Reported | Ipswitch        
Business Acquisition [Line Items]        
Net working capital $ 6,068      
Property, plant and equipment 4,661      
Other assets 314      
Deferred revenue (12,696)      
Goodwill 117,651      
Net assets acquired 225,298      
Previously Reported | Purchased technology | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets 33,100      
Previously Reported | Trade name | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets 9,600      
Previously Reported | Customer relationships | Ipswitch        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 66,600