Stock-Based Compensation (Narratives) (Details) (USD $)	3 Months Ended		9 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2012	Aug. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life of stock options outstanding (in years)	6.6		6.6
Weighted average remaining contractual life of stock options exercisable (in years)	5.8		5.8
Unrecognized compensation cost, total	$ 2,400,000		$ 2,400,000
Intrinsic value of stock options outstanding	7,900,000		7,900,000
Intrinsic value of stock options exercisable	0		0
Restricted Stock, Phantom Shares and SARs Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income) associated with stock options, total	400,000	(500,000)	1,200,000	900,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense (income) associated with stock options, total	$ 1,100,000	$ 1,500,000	$ 3,500,000	$ 4,200,000