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Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 05, 2020
May 31, 2020
Apr. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Business Acquisition [Line Items]            
Goodwill       $ 491,726 $ 432,824 $ 314,992
Measurement Period Adjustments            
Goodwill       (838) $ 0  
Chef acquisition            
Business Acquisition [Line Items]            
Net working capital $ 52,330          
Property, plant and equipment 498          
Intangible assets       141,300    
Other assets 122          
Other noncurrent liabilities (841)          
Lease liabilities, net (1,810)          
Deferred taxes (7,817)          
Deferred revenue (12,525)          
Goodwill 59,858     $ 59,900    
Net assets acquired 231,115          
Chef acquisition | Purchased technology            
Business Acquisition [Line Items]            
Intangible assets $ 38,300          
Measurement Period Adjustments            
Finite-lived intangible assets, useful life 5 years          
Chef acquisition | Trade Names            
Business Acquisition [Line Items]            
Intangible assets $ 5,700          
Measurement Period Adjustments            
Finite-lived intangible assets, useful life 5 years          
Chef acquisition | Customer relationships            
Business Acquisition [Line Items]            
Intangible assets $ 97,300          
Measurement Period Adjustments            
Finite-lived intangible assets, useful life 7 years          
Ipswitch            
Business Acquisition [Line Items]            
Net working capital     $ 6,719      
Property, plant and equipment     4,661      
Other assets     310      
Deferred revenue     (12,725)      
Goodwill   $ 600 117,033      
Net assets acquired     225,298      
Measurement Period Adjustments            
Net working capital     651      
Other assets   (4)        
Deferred revenue   (29)        
Goodwill   (618)        
Net assets acquired   $ 0        
Ipswitch | Purchased technology            
Business Acquisition [Line Items]            
Intangible assets     $ 33,100      
Measurement Period Adjustments            
Finite-lived intangible assets, useful life     5 years      
Ipswitch | Trade Names            
Business Acquisition [Line Items]            
Intangible assets     $ 9,600      
Measurement Period Adjustments            
Finite-lived intangible assets, useful life     5 years      
Ipswitch | Customer relationships            
Business Acquisition [Line Items]            
Intangible assets     $ 66,600      
Measurement Period Adjustments            
Finite-lived intangible assets, useful life     5 years      
Ipswitch | Previously reported            
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      
Ipswitch | Previously reported | Purchased technology            
Business Acquisition [Line Items]            
Intangible assets     33,100      
Ipswitch | Previously reported | Trade Names            
Business Acquisition [Line Items]            
Intangible assets     9,600      
Ipswitch | Previously reported | Customer relationships            
Business Acquisition [Line Items]            
Intangible assets     $ 66,600