Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 2,561	$ 1,680	$ 8,715	$ 2,001
Restructuring reserve	2,311		2,311		$ 1,643
2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,500		7,407
Restructuring reserve	1,971		1,971		0
2015 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2,000		2,000
2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			1,335	1,500
Restructuring reserve	213		213		1,227
2014 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves	200		200
2012 and 2013 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			(27)	$ 500
Restructuring reserve	127		127		$ 416
2012 and 2013 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	100		100
Level 3 [Member] | Nonrecurring Basis [Member]
Restructuring Cost and Reserve [Line Items]
Long-lived assets at fair value	$ 60		$ 60