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Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Feb. 29, 2020
Nov. 30, 2019
Business Acquisition [Line Items]      
Goodwill   $ 432,789 $ 432,824
Ipswitch      
Business Acquisition [Line Items]      
Net working capital $ 5,852    
Property, plant and equipment 4,661    
Other assets 310    
Deferred revenue (12,696)    
Goodwill 117,871    
Net assets acquired 225,298    
Measurement Period Adjustments      
Net working capital (216)    
Other assets (4)    
Goodwill 220    
Net assets acquired 0    
Purchased technology | Ipswitch      
Business Acquisition [Line Items]      
Intangible assets $ 33,100    
Measurement Period Adjustments      
Acquired intangible assets, Life 5 years    
Trade name | Ipswitch      
Business Acquisition [Line Items]      
Intangible assets $ 9,600    
Measurement Period Adjustments      
Acquired intangible assets, Life 5 years    
Customer-related | Ipswitch      
Business Acquisition [Line Items]      
Intangible assets $ 66,600    
Measurement Period Adjustments      
Acquired intangible assets, 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]      
Intangible assets 33,100    
Previously Reported | Trade name | Ipswitch      
Business Acquisition [Line Items]      
Intangible assets 9,600    
Previously Reported | Customer-related | Ipswitch      
Business Acquisition [Line Items]      
Intangible assets $ 66,600