Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Nov. 30, 2019	Feb. 28, 2017	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 6,331	$ 2,251	$ 22,210
2019 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			2,494
Short-term restructuring reserves	$ 1,500		1,500
2017 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			739	$ 2,251	$ 22,125
Percentage of reduction of global workforce (more than)		20.00%
Other Accrued Liabilities | 2017 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves	200		200
DataRPM and Kinvey
Restructuring Cost and Reserve [Line Items]
Impairment of intangible assets	22,700
Ipswitch | 2019 Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			3,098
Short-term restructuring reserves	600		$ 600
Trademarks and trade names | DataRPM and Kinvey
Restructuring Cost and Reserve [Line Items]
Impairment of intangible assets	$ 22,700