Restructuring (Summary of Restructuring Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,550	$ 3,361	$ 1,643
Costs incurred	22,210	1,692	12,989
Cash disbursements	(19,234)	(3,539)	(6,343)
Asset impairment	(762)		(4,962)
Translation adjustments and other	362	36	34
Ending Balance	4,126	1,550	3,361
Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	107	412	416
Costs incurred	2,655	319	5,567
Cash disbursements	(1,456)	(633)	(690)
Asset impairment	(762)		(4,962)
Translation adjustments and other	26	9	81
Ending Balance	570	107	412
Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,443	2,949	1,227
Costs incurred	19,555	1,373	7,422
Cash disbursements	(17,778)	(2,906)	(5,653)
Asset impairment	0		0
Translation adjustments and other	336	27	(47)
Ending Balance	3,556	1,443	2,949
2017 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Costs incurred	22,125
Cash disbursements	(17,629)
Asset impairment	(762)
Translation adjustments and other	362
Ending Balance	4,096	0
2017 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Costs incurred	2,570
Cash disbursements	(1,294)
Asset impairment	(762)
Translation adjustments and other	26
Ending Balance	540	0
2017 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0
Costs incurred	19,555
Cash disbursements	(16,335)
Asset impairment	0
Translation adjustments and other	336
Ending Balance	3,556	0
2016 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,415	0
Costs incurred	1,500	1,482
Cash disbursements	(1,415)	(67)
Ending Balance	0	1,415	0
2016 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0
Costs incurred		0
Cash disbursements	0	0
Ending Balance	0	0	0
2016 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	1,415	0
Costs incurred		1,482
Cash disbursements	(1,415)	(67)
Ending Balance	0	1,415	0
2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	28	2,617	0
Costs incurred		(42)	4,071
Cash disbursements	(28)	(2,572)	(483)
Asset impairment			(963)
Translation adjustments and other		25	(8)
Ending Balance	0	28	2,617
2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Costs incurred		0	963
Cash disbursements	0	0	0
Asset impairment			(963)
Translation adjustments and other		0	0
Ending Balance	0	0	0
2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	28	2,617	0
Costs incurred		(42)	3,108
Cash disbursements	(28)	(2,572)	(483)
Asset impairment			0
Translation adjustments and other		25	(8)
Ending Balance	0	28	2,617
2012 - 2014 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	50	227	1,643
Costs incurred	63	(31)	1,404
Cash disbursements	(83)	(156)	(2,759)
Translation adjustments and other		10	(61)
Ending Balance	30	50	227
2012 - 2014 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	50	203	416
Costs incurred	63	(7)	198
Cash disbursements	(83)	(156)	(390)
Translation adjustments and other		10	(21)
Ending Balance	30	50	203
2012 - 2014 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0	24	1,227
Costs incurred	0	(24)	1,206
Cash disbursements	0	0	(2,369)
Translation adjustments and other		0	(40)
Ending Balance	0	0	24
Telerik AD [Member] | 2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	57	518	0
Costs incurred	22	283	7,514
Cash disbursements	(79)	(744)	(3,101)
Asset impairment			(3,999)
Translation adjustments and other		0	104
Ending Balance	0	57	518
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	57	209	0
Costs incurred	22	326	4,406
Cash disbursements	(79)	(477)	(300)
Asset impairment			(3,999)
Translation adjustments and other		(1)	102
Ending Balance	0	57	209
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	0	309	0
Costs incurred	0	(43)	3,108
Cash disbursements	0	(267)	(2,801)
Asset impairment			0
Translation adjustments and other		1	2
Ending Balance	$ 0	$ 0	$ 309