Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended				9 Months Ended			9 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014 2014 Restructuring Activities [Member]	Aug. 31, 2014 2014 Restructuring Activities [Member] Other accrued liabilities [Member]	Aug. 31, 2014 2013 Restructuring Activities [Member]	Nov. 30, 2013 2013 Restructuring Activities [Member]	Aug. 31, 2014 2013 Restructuring Activities [Member] Other accrued liabilities [Member]	Aug. 31, 2014 2012 Restructuring Activities [Member]	Nov. 30, 2013 2012 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,680,000	$ 5,401,000	$ 2,001,000	$ 9,127,000	$ 1,500,000		$ (317,000)			$ (198,000)
Short-term restructuring reserves						1,500,000				300,000
Restructuring Reserve							310,000	1,646,000	200,000	343,000	906,000
Long-term restructuring reserves							$ 100,000