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Stock-Based Compensation (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Stock Based Compensation (Additional Textual) [Abstract]    
Weighted average remaining contractual life of stock options outstanding 7.1  
Weighted average remaining contractual life of stock options exercisable 6.3  
Unrecognized compensation cost, total $ 4.6  
Intrinsic value of stock options outstanding 9.0  
Intrinsic value of stock options exercisable 0.2  
Restricted stock, Phantom shares and SARs awards [Member]
   
Stock based Compensation (Textual) [Abstract]    
Stock-based compensation expense associated with stock options, total 0.4 1.0
Stock Options [Member]
   
Stock based Compensation (Textual) [Abstract]    
Stock-based compensation expense associated with stock options, total $ 1.2 $ 1.4