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Restructuring (Summary of Restructuring Activity) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Restructuring Reserve [Roll Forward]      
Beginning Balance $ 2,203 $ 311 $ 4,126
Costs incurred 5,906 6,331 2,251
Cash disbursements (4,123) (4,407) (6,111)
Asset impairment (20)    
Translation adjustments and other 7 (32) 45
Ending Balance 3,973 2,203 311
Excess Facilities and Other Costs      
Restructuring Reserve [Roll Forward]      
Beginning Balance 196 307 570
Costs incurred 1,812 740 1,011
Cash disbursements (1,569) (760) (1,309)
Asset impairment (20)    
Translation adjustments and other 2 (91) 35
Ending Balance 421 196 307
Employee Severance and Related Benefits      
Restructuring Reserve [Roll Forward]      
Beginning Balance 2,007 4 3,556
Costs incurred 4,094 5,591 1,240
Cash disbursements (2,554) (3,647) (4,802)
Asset impairment 0    
Translation adjustments and other 5 59 10
Ending Balance 3,552 2,007 4
2020 Restructuring Activities      
Restructuring Reserve [Roll Forward]      
Beginning Balance 0    
Costs incurred 3,947    
Cash disbursements (429)    
Translation adjustments and other 5    
Ending Balance 3,523 0  
2020 Restructuring Activities | Excess Facilities and Other Costs      
Restructuring Reserve [Roll Forward]      
Beginning Balance 0    
Costs incurred 0    
Cash disbursements 0    
Translation adjustments and other 0    
Ending Balance 0 0  
2020 Restructuring Activities | Employee Severance and Related Benefits      
Restructuring Reserve [Roll Forward]      
Beginning Balance 0    
Costs incurred 3,947    
Cash disbursements (429)    
Translation adjustments and other 5    
Ending Balance 3,523 0  
2019 Restructuring Activities      
Restructuring Reserve [Roll Forward]      
Beginning Balance 1,460 0  
Costs incurred 108 2,494  
Cash disbursements (1,546) (1,035)  
Translation adjustments and other   1  
Ending Balance 22 1,460 0
2019 Restructuring Activities | Excess Facilities and Other Costs      
Restructuring Reserve [Roll Forward]      
Beginning Balance 0 0  
Costs incurred 0 0  
Cash disbursements 0 0  
Translation adjustments and other   0  
Ending Balance 0 0 0
2019 Restructuring Activities | Employee Severance and Related Benefits      
Restructuring Reserve [Roll Forward]      
Beginning Balance 1,460 0  
Costs incurred 108 2,494  
Cash disbursements (1,546) (1,035)  
Translation adjustments and other   1  
Ending Balance 22 1,460 0
2017 Restructuring Activities      
Restructuring Reserve [Roll Forward]      
Beginning Balance 191 311 4,096
Costs incurred 365 739 2,251
Cash disbursements (549) (768) (6,081)
Asset impairment   (89)  
Translation adjustments and other (3) (2) 45
Ending Balance 4 191 311
2017 Restructuring Activities | Excess Facilities and Other Costs      
Restructuring Reserve [Roll Forward]      
Beginning Balance 191 307 540
Costs incurred 365 735 1,011
Cash disbursements (549) (760) (1,279)
Asset impairment   (89)  
Translation adjustments and other (3) (2) 35
Ending Balance 4 191 307
2017 Restructuring Activities | Employee Severance and Related Benefits      
Restructuring Reserve [Roll Forward]      
Beginning Balance 0 4 3,556
Costs incurred 0 4 1,240
Cash disbursements 0 (8) (4,802)
Asset impairment   0  
Translation adjustments and other 0 0 10
Ending Balance 0 0 4
Ipswitch | 2019 Restructuring Activities      
Restructuring Reserve [Roll Forward]      
Beginning Balance 552 0  
Costs incurred 1,486 3,098  
Cash disbursements (1,599) (2,604)  
Asset impairment (20)    
Translation adjustments and other 5 58  
Ending Balance 424 552 0
Ipswitch | 2019 Restructuring Activities | Excess Facilities and Other Costs      
Restructuring Reserve [Roll Forward]      
Beginning Balance 5 0  
Costs incurred 1,447 5  
Cash disbursements (1,020) 0  
Asset impairment (20)    
Translation adjustments and other 5 0  
Ending Balance 417 5 0
Ipswitch | 2019 Restructuring Activities | Employee Severance and Related Benefits      
Restructuring Reserve [Roll Forward]      
Beginning Balance 547 0  
Costs incurred 39 3,093  
Cash disbursements (579) (2,604)  
Asset impairment 0    
Translation adjustments and other 0 58  
Ending Balance $ 7 $ 547 $ 0