Restructuring Charges (Narrative) (Details) $ in Thousands	3 Months Ended
	Feb. 29, 2016 USD ($)	Nov. 30, 2015 USD ($) Segments	May. 31, 2015 USD ($)	Feb. 28, 2015 USD ($) facility
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ (66)			$ 2,344
Restructuring reserve	1,718	$ 3,361
2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility				2
Restructuring expenses	(123)
Restructuring reserve	1,342	$ 2,617
Number of operating segments | Segments		3
2015 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	1,300
2012 - 2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses				$ 1,400
2012 - 2014 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	100
Level 3 [Member] | Nonrecurring Basis [Member]
Restructuring Cost and Reserve [Line Items]
Long-lived assets at fair value			$ 100
Telerik AD [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of long-lived assets			$ 4,000
Telerik AD [Member] | 2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	52			$ 1,000
Restructuring reserve	226	$ 518
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 200