Restructuring (Narrative) (Details) $ in Thousands	3 Months Ended			12 Months Ended
	Feb. 28, 2017	May 31, 2016 USD ($)	Feb. 29, 2016 facility	Nov. 30, 2017 USD ($)	Nov. 30, 2016 USD ($)	Nov. 30, 2015 USD ($)	May 31, 2015 USD ($)	Nov. 30, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				$ 22,210	$ 1,692	$ 12,989
Restructuring reserve				4,126	1,550	3,361		$ 1,643
2017 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent	20.00%
Restructuring expenses				22,125
Restructuring reserve				4,096	0
2016 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				1,500	1,482
Restructuring reserve				0	1,415	0
2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses					(42)	4,071
Restructuring reserve				0	28	2,617		0
2012 - 2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				63	(31)	1,404
Restructuring reserve				30	50	227		1,643
Other Accrued Liabilities [Member] | 2017 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves				4,000
Other Noncurrent Liabilities [Member] | 2017 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Long-term portion of restructuring reserve				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				22	283	7,514
Restructuring reserve				$ 0	$ 57	$ 518		$ 0
Level 3 [Member] | Nonrecurring Basis [Member] | Telerik AD [Member]
Restructuring Cost and Reserve [Line Items]
Property and equipment, estimated fair value							$ 100