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Retirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2013
Dec. 01, 2012
Dec. 03, 2011
Postretirement Benefits      
Increase (decrease) in noncurrent liabilities to recognize changes in funded status of a defined benefit postretirement plan $ (116) $ 62 $ 37
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan 68 (48) (35)
Other changes in benefit obligations recognized in other comprehensive loss:      
Actuarial (gain) loss (108) 77 56
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 137 139 146
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 3,399 2,571  
Expense for employer matching benefit to the Deferred Compensation Plan 29 29 31
Postretirement benefits, life and health
     
Postretirement Benefits      
Increase (decrease) in noncurrent liabilities to recognize changes in funded status of a defined benefit postretirement plan (116) 77 56
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan 68 (48) (35)
Change in benefit obligation:      
Benefit obligation at beginning of year 488 426  
Actuarial (gain) loss (108) 77  
Interest cost 16 17 18
Service cost 9 11 10
Benefits paid   (4)  
Amortization of actuarial gain (33) (39) (46)
Benefit obligation at end of year 372 488 426
Amounts that will be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year      
Estimated net actuarial gain 47    
Components of postretirement benefits expense (income)      
Service cost 9 11 10
Interest 16 17 18
Amortization of actuarial gain (33) (39) (46)
Total income (8) (11) (18)
Other changes in benefit obligations recognized in other comprehensive loss:      
Actuarial (gain) loss (108) 77 56
Total recognized in net periodic benefit (income) expense and other comprehensive loss (116) 66 38
Health care cost      
Assumed health care cost trend utilized for next year (as a percent) 7.20%    
Ultimate assumed rate (as a percent) 4.50%    
Effects of one-percentage-point change in assumed health care cost trend rates      
Effect of one-percentage-point increase on total of service and interest cost 1    
Effect of one-percentage-point decrease on total of service and interest cost (1)    
Effect of one-percentage-point increase on postretirement benefit obligation 10    
Effect of one-percentage-point decrease on postretirement benefit obligation (9)    
Discount rate      
Discount rate used to compute accumulated postretirement benefit obligations (as a percent) 4.60% 3.59%  
Discount rates used to compute net periodic benefit expense (as a percent) 3.59% 4.50% 5.23%
Future benefit payment expected to be paid      
2014 9    
2015 9    
2016 12    
2017 12    
2018 15    
2019-2023 113    
Postretirement benefits, life and health | Retirees
     
Change in benefit obligation:      
Benefit obligation at end of year   16  
Postretirement benefits, life and health | Fully eligible active participants
     
Change in benefit obligation:      
Benefit obligation at end of year 230 273  
Postretirement benefits, life and health | Other active participants
     
Change in benefit obligation:      
Benefit obligation at end of year $ 142 $ 199