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Retirement Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2013
Feb. 28, 2014
Postretirement Benefits        
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan     $ 68  
Change in benefit obligation:        
Curtailment gain   $ (309)    
Other changes in benefit obligations recognized in other comprehensive loss:        
Actuarial gain     (108)  
Savings Plan        
401(k) Savings Plan        
Employer matching contribution as a percentage of each employee's contribution 60.00%      
Contributions to the Griffin Savings Plan $ 60 64 137  
Savings Plan | Maximum        
401(k) Savings Plan        
Employer matching contribution as a percentage of base salary 5.00%      
Deferred Compensation Plan        
Deferred Compensation Plan        
Liability under Deferred Compensation Plan $ 3,981 3,784    
Expense for employer matching benefit to the Deferred Compensation Plan $ 22 28 29  
Postretirement benefits, life and health        
Postretirement Benefits        
Increase (decrease) in noncurrent liabilities to recognize changes in funded status of a defined benefit postretirement plan     118  
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan     68  
Benefit obligation   332 332 $ 23
Change in benefit obligation:        
Benefit obligation at beginning of year   332    
Actuarial (gain) loss   (14)    
Interest cost   4 16  
Service cost   1 7  
Amortization of actuarial gain   (14) (33)  
Curtailment gain   309    
Benefit obligation at end of year     332  
Components of postretirement benefits expense (income)        
Service cost   1 7  
Interest   4 16  
Amortization of actuarial gain   (14) (33)  
Total income   (318) (10)  
Other changes in benefit obligations recognized in other comprehensive loss:        
Actuarial gain   (14) (108)  
Total recognized in net periodic benefit income and other comprehensive income   $ (332) $ (118)  
Discount rate        
Discount rate used to compute accumulated postretirement benefit obligations (as a percent)   4.60%    
Discount rates used to compute net periodic benefit expense (as a percent)   4.60% 3.59%