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Business Combinations (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2020
Apr. 30, 2019
May 31, 2020
Aug. 31, 2020
Nov. 30, 2019
Business Acquisition [Line Items]          
Goodwill       $ 431,864 $ 432,824
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]          
Goodwill       $ (838)  
Ipswitch          
Business Acquisition [Line Items]          
Net working capital $ 6,719   $ 6,719    
Property, plant and equipment 4,661   4,661    
Other assets 310   310    
Deferred revenue (12,725)   (12,725)    
Goodwill 117,033 $ 117,000 117,033    
Net assets acquired 225,298   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 $ 33,100 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 $ 9,600 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 $ 66,600 $ 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