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Employee Benefit and Stock Plans (Details Textual) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Nov. 30, 2010
Person
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Oct. 06, 2011
Oct. 07, 2010
Nov. 30, 2012
Stock Options
Nov. 30, 2012
Restricted Stock
Nov. 30, 2011
Restricted Stock
Nov. 30, 2010
Restricted Stock
Nov. 30, 2012
Performance Shares
Nov. 30, 2012
Saving Plan
Nov. 30, 2011
Saving Plan
Nov. 30, 2010
Saving Plan
Nov. 30, 2012
Maximum
Nov. 30, 2012
Maximum
Performance Shares
Nov. 30, 2012
Minimum
Performance Shares
Nov. 30, 2012
1988 Employee Stock Plan
Aug. 31, 2010
August 2010 Exchange Offer
Person
Nov. 30, 2012
August 2010 Exchange Offer
Aug. 31, 2010
Employee Stock Option
Person
Nov. 30, 2010
November 2010 Exchange Offer
Person
Nov. 30, 2008
Phantom Share Units (PSUs)
Nov. 30, 2012
Phantom Share Units (PSUs)
Nov. 30, 2011
Phantom Share Units (PSUs)
Nov. 30, 2010
Phantom Share Units (PSUs)
Nov. 30, 2012
2010 Equity Incentive Plan
Apr. 07, 2011
2010 Equity Incentive Plan
Apr. 01, 2010
2010 Equity Incentive Plan
Nov. 30, 2012
Stock Appreciation Rights (SARs)
Nov. 30, 2011
Stock Appreciation Rights (SARs)
Nov. 30, 2010
Stock Appreciation Rights (SARs)
Employee Benefit and Stock Plans (Textual) [Abstract]                                                                
Aggregate cost related to saving plan                       $ 2,600,000 $ 2,800,000 $ 3,200,000                                    
Net assets invested in funds consisting common stock                       7.00% 4.00% 5.00%                                    
Number of shares authorized for issuance of stock based awards to employees                                                         3,500,000      
Grant of stock option, Reduce the plan share capacity                                                         1      
Grant of restricted stock, Reduce the Plan share capacity                                                         1.78      
Number of additional shares authorized for issuance of stock based awards to employees                                                       4,000,000        
Share Based payments award terms of Award                                   15 years                 10 years          
Number of eligible employees returned SARs related to the exchange offer to the company                                     19                          
SARs returned to the company                                     1,116,030     925,705                    
Number of Employees to purchase Company's common stock in exchange for corresponding grants of stock options                                         18                      
Common Stock Purchase by Employee                                     1,073,737     732,170                    
Purchase price of common stock per share for 18 eligible employees                                       $ 19.90                        
Shares purchase per employee                                       42,293   193,535                    
Purchase price of common stock per share for 1 eligible employees                                       $ 11.25                        
Number of employees to whom stock options granted in exchange for stock appreciation rights 7                                         9                    
Number of Employees to whom one grant of stock options to purchase Company's common stock                                     1                          
Purchase price of common stock per share                                           $ 28.10                    
Purchase price of common stock per share for 7 eligible employees                                           $ 36.19                    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition             1 year 3 months 24 days       3 years                                          
Grant, award share percentage                               200.00% 0.00%                              
Minimum period of restriction imposed on share grant lapse   3 years                 3 years                                          
Weighted average per share grant date fair value               $ 15.81 $ 15.03 $ 15.09 $ 16.23                                          
Outstanding at end of year, Shares               229,724 338,912 402,477 227,049                         0 5,556 268,762       29,939 29,939,000 37,517
Total unrecognized stock-based compensation expense related to unvested stock option awards             1,700,000 3,300,000     3,600,000                                          
Vesting period of vesting shares                                             3 years                  
SARs vest in equal annual installments period                                             3 years                  
Employee Benefit and Stock Plan (Additional Textual) [Abstract]                                                                
Exercises in period, total intrinsic value     0 100,000                     100,000                                  
Exercises in period (in shares)   7,494 0 28,281                                                        
Intrinsic value of stock options outstanding 300,000 18,200,000 1,700,000 300,000                                                        
Intrinsic value of stock options exercisable 100,000 7,800,000 0 100,000                                                        
Performance-based stock options to purchase an aggregate shares of company's common stock         365,000 260,000                                                    
Company's common stock at the purchase price per share         $ 6.32 $ 11.06                                                    
Grant-date fair value per performance-based stock option         $ 2.54 $ 4.59                                                    
Weighted average fair value of stock options granted   $ 4.18 $ 2.56 $ 2.81                                                        
Stock-based compensation expense related to stock option grants   5,000,000 5,900,000 5,800,000                                                        
Tax shortfall from cancellation of stock awards   300,000 1,000,000 2,800,000                                                        
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities   0 0 583,000                                                        
Recognized compensation expense related to various stock   $ 1,700,000 $ 1,200,000 $ 700,000                                                        
Shares of common stock held in trust   10,615,934 10,884,151