Restructuring (Summary of Restructuring Activity) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Nov. 30, 2015	Feb. 28, 2015	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 1,643	$ 1,643	$ 2,552	$ 7,307
Costs incurred			12,989	2,294	13,017
Cash disbursements			(6,343)	(3,175)	(17,726)
Asset impairment			(4,962)		(111)
Translation adjustments and other			34	(28)	65
Ending Balance	$ 3,361		3,361	1,643	2,552
Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		416	416	1,184	603
Costs incurred			5,567	579	2,671
Cash disbursements			(690)	(1,316)	(1,933)
Asset impairment			(4,962)		(111)
Translation adjustments and other			81	(31)	(46)
Ending Balance	412		412	416	1,184
Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		1,227	1,227	1,368	6,704
Costs incurred			7,422	1,715	10,346
Cash disbursements			(5,653)	(1,859)	(15,793)
Asset impairment			0		0
Translation adjustments and other			(47)	3	111
Ending Balance	2,949		2,949	1,227	1,368
2012 and 2013 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		416	416	2,552	7,032
Costs incurred			68	630	13,017
Cash disbursements			(314)	(2,738)	(17,451)
Asset impairment					(111)
Translation adjustments and other			(21)	(28)	65
Ending Balance	149		149	416	2,552
2012 and 2013 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		416	416	1,184	603
Costs incurred			68	579	2,671
Cash disbursements			(314)	(1,316)	(1,933)
Asset impairment					(111)
Translation adjustments and other			(21)	(31)	(46)
Ending Balance	149		149	416	1,184
2012 and 2013 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0	1,368	6,429
Costs incurred			0	51	10,346
Cash disbursements			0	(1,422)	(15,518)
Asset impairment					0
Translation adjustments and other			0	3	111
Ending Balance	0		0	0	1,368
2014 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		1,227	1,227	0
Costs incurred			1,336	1,664
Cash disbursements			(2,445)	(437)
Translation adjustments and other			(40)
Ending Balance	78		78	1,227	0
2014 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0	0
Costs incurred			130	0
Cash disbursements			(76)	0
Translation adjustments and other			0
Ending Balance	54		54	0	0
2014 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		1,227	1,227	0
Costs incurred			1,206	1,664
Cash disbursements			(2,369)	(437)
Translation adjustments and other			(40)
Ending Balance	24		24	1,227	$ 0
2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0
Costs incurred	4,100		4,071
Cash disbursements			(483)
Asset impairment			(963)
Translation adjustments and other			(8)
Ending Balance	2,617		2,617	0
2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0
Costs incurred			963
Cash disbursements			0
Asset impairment			(963)
Translation adjustments and other			0
Ending Balance	0		0	0
2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0
Costs incurred			3,108
Cash disbursements			(483)
Asset impairment			0
Translation adjustments and other			(8)
Ending Balance	2,617		2,617	0
Telerik AD [Member] | 2015 Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0
Costs incurred		7,500	7,514
Cash disbursements			(3,101)
Asset impairment			(3,999)
Translation adjustments and other			104
Ending Balance	518		518	0
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		0	0
Costs incurred			4,406
Cash disbursements			(300)
Asset impairment			(3,999)
Translation adjustments and other			102
Ending Balance	209		209	0
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 0	0
Costs incurred			3,108
Cash disbursements			(2,801)
Asset impairment			0
Translation adjustments and other			2
Ending Balance	$ 309		$ 309	$ 0