Restructuring (Narrative) (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Nov. 30, 2015 USD ($)	May. 31, 2015 USD ($)	Feb. 28, 2015 USD ($) facility	Nov. 30, 2015 USD ($)	Nov. 30, 2014 USD ($)	Nov. 30, 2013 USD ($)	Nov. 30, 2012 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				$ 12,989	$ 2,294	$ 13,017
Restructuring reserve	$ 3,361			3,361	1,643	2,552	$ 7,307
Excess Facilities and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				5,567	579	2,671
Restructuring reserve	412			412	416	1,184	603
Employee Severance and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				7,422	1,715	10,346
Restructuring reserve	2,949			2,949	1,227	1,368	6,704
2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	4,100			4,071
Restructuring reserve	2,617			2,617	0
2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				963
Restructuring reserve	0			0	0
2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				3,108
Restructuring reserve	2,617			2,617	0
2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				1,336	1,664
Restructuring reserve	78			78	1,227	0
2014 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				130	0
Restructuring reserve	54			54	0	0
2014 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				1,206	1,664
Restructuring reserve	24			24	1,227	0
2012 and 2013 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				68	630	13,017
Restructuring reserve	149			149	416	2,552	7,032
2012 and 2013 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				68	579	2,671
Restructuring reserve	149			149	416	1,184	603
2012 and 2013 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				0	51	10,346
Restructuring reserve	0			0	0	1,368	$ 6,429
Other Accrued Liabilities [Member] | 2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves	2,600			2,600
Other Accrued Liabilities [Member] | 2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	100			100
Other Accrued Liabilities [Member] | 2012 and 2013 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	100			100
Telerik AD [Member]
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility			2
Impairment of long-lived assets held-for-use		$ 4,000
Telerik AD [Member] | 2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			$ 7,500	7,514
Restructuring reserve	518			518	0
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				4,406
Restructuring reserve	209			209	0
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				3,108
Restructuring reserve	309			309	$ 0
Telerik AD [Member] | Other Accrued Liabilities [Member] | 2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves	500			500
Level 3 [Member] | Nonrecurring Basis [Member]
Restructuring Cost and Reserve [Line Items]
Property and equipment, estimated fair value	$ 60			$ 60
Level 3 [Member] | Nonrecurring Basis [Member] | Telerik AD [Member]
Restructuring Cost and Reserve [Line Items]
Property and equipment, estimated fair value		$ 100
Income from Discontinued Operations, Net [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses						$ 1,000