Restructuring (Summary of Restructuring Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2019
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 3,973	$ 2,203	$ 311
Costs incurred	6,308	5,906	6,331
Cash disbursements	(5,519)	(4,123)	(4,407)
Translation adjustments and other	1,610	(13)	(32)
Ending Balance	6,372	3,973	2,203
Excess Facilities and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	421	196	307
Costs incurred	3,518	1,812	740
Cash disbursements	(1,072)	(1,569)	(760)
Translation adjustments and other	1,616	(18)	(91)
Ending Balance	4,483	421	196
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	3,552	2,007	4
Costs incurred	2,790	4,094	5,591
Cash disbursements	(4,447)	(2,554)	(3,647)
Translation adjustments and other	(6)	5	59
Ending Balance	1,889	3,552	2,007
2021 Restructuring Activities
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Costs incurred	1,965
Cash disbursements	(69)
Translation adjustments and other	(14)
Ending Balance	1,882	0
2021 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
2021 Restructuring Activities | Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Costs incurred	1,965
Cash disbursements	(69)
Translation adjustments and other	(14)
Ending Balance	1,882	0
2020 Restructuring Activities
Restructuring Reserve [Roll Forward]
Beginning Balance	3,523	0
Costs incurred	4,149	3,947
Cash disbursements	(4,805)	(429)
Translation adjustments and other	1,623	5
Ending Balance	4,490	3,523	0
2020 Restructuring Activities | Excess Facilities and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0
Costs incurred	3,323	0
Cash disbursements	(455)	0
Translation adjustments and other	1,615	0
Ending Balance	4,483	0	0
2020 Restructuring Activities | Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	3,523	0
Costs incurred	826	3,947
Cash disbursements	(4,350)	(429)
Translation adjustments and other	8	5
Ending Balance	7	3,523	0
2019 Restructuring Activities
Restructuring Reserve [Roll Forward]
Beginning Balance	22	1,460	0
Costs incurred	6	108	2,494
Cash disbursements	(28)	(1,546)	(1,035)
Translation adjustments and other			1
Ending Balance	0	22	1,460
2019 Restructuring Activities | Excess Facilities and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Costs incurred	0	0	0
Cash disbursements	0	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	22	1,460	0
Costs incurred	6	108	2,494
Cash disbursements	(28)	(1,546)	(1,035)
Translation adjustments and other			1
Ending Balance	0	22	1,460
Ipswitch | 2019 Restructuring Activities
Restructuring Reserve [Roll Forward]
Beginning Balance	424	552	0
Costs incurred	(9)	1,486	3,098
Cash disbursements	(416)	(1,599)	(2,604)
Asset impairment		0
Translation adjustments and other	1	(15)	58
Ending Balance	0	424	552
Ipswitch | 2019 Restructuring Activities | Excess Facilities and Other Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	417	5	0
Costs incurred	(2)	1,447	5
Cash disbursements	(416)	(1,020)	0
Asset impairment		0
Translation adjustments and other	1	(15)	0
Ending Balance	0	417	5
Ipswitch | 2019 Restructuring Activities | Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	7	547	0
Costs incurred	(7)	39	3,093
Cash disbursements	0	(579)	(2,604)
Asset impairment		0
Translation adjustments and other	0	0	58
Ending Balance	$ 0	$ 7	$ 547