Restructuring Charges (Narrative) (Details) (USD $)	3 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Nov. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 2,344,000	$ 196,000
2015 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,012,000
Restructuring Reserve	545,000		0
2015 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	500,000
2014 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,359,000
Restructuring Reserve	1,821,000		1,227,000
2014 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Short-term restructuring reserves	1,800,000
2013 Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	(27,000)
Restructuring Reserve	210,000		416,000
Long-term restructuring reserves	100,000
2013 Restructuring Activities [Member] | Other accrued liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 100,000