Restructuring Charges (Summary of Restructuring Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 3,361
Costs incurred	$ (36)	$ 2,561	229	$ 8,715
Cash disbursements			(3,001)
Translation adjustments and other			24
Ending Balance	613		613
Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			412
Costs incurred			338
Cash disbursements			(514)
Translation adjustments and other			4
Ending Balance	240		240
Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			2,949
Costs incurred			(109)
Cash disbursements			(2,487)
Translation adjustments and other			20
Ending Balance	373		373
2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			2,617
Costs incurred			(42)
Cash disbursements			(2,220)
Translation adjustments and other			(16)
Ending Balance	371		371
2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			0
Costs incurred			0
Cash disbursements			0
Translation adjustments and other			0
Ending Balance	0		0
2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			2,617
Costs incurred			(42)
Cash disbursements			(2,220)
Translation adjustments and other			(16)
Ending Balance	371		371
Telerik AD [Member] | 2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			518
Costs incurred		$ 2,500	280	$ 7,400
Cash disbursements			(625)
Translation adjustments and other			7
Ending Balance	180		180
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			209
Costs incurred			323
Cash disbursements			(358)
Translation adjustments and other			4
Ending Balance	178		178
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance			309
Costs incurred			(43)
Cash disbursements			(267)
Translation adjustments and other			3
Ending Balance	$ 2		$ 2