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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 29, 2020
Nov. 30, 2019
Feb. 28, 2019
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses $ 1,040   $ 415
Ipswitch      
Restructuring Cost and Reserve [Line Items]      
Impairment of intangible assets   $ 900  
Technologies And Trade Names | DataRPM and Kinvey      
Restructuring Cost and Reserve [Line Items]      
Impairment of intangible assets   $ 22,700  
2019 Restructuring Activities      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 600    
Restructuring expenses (9)    
2019 Restructuring Activities | Ipswitch      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 1,000    
Restructuring expenses 1,036    
2019 Restructuring Activities | Ipswitch | Short-Term Lease Liability      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve 800    
2019 Restructuring Activities | Ipswitch | Other Accrued Liabilities      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve $ 200