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Retirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 01, 2012
Dec. 03, 2011
Nov. 27, 2010
Postretirement Benefits      
Increase (decrease) in noncurrent liabilities to recognize changes in funded status of a defined benefit postretirement plan $ 77 $ 56 $ (304)
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan (48) (35) 188
Savings Plan
     
401(k) Savings Plan      
Employer matching contribution as a percentage of each employee's contribution 60.00%    
Maximum employer matching contribution as a percentage of base salary 5.00%    
Contributions to the Griffin Savings Plan 139 146 132
Deferred Compensation Plan
     
Deferred Compensation Plan      
Liability under Deferred Compensation Plan 2,571 2,165  
Expense for employer matching benefit to the Deferred Compensation Plan 29 31 32
Postretirement benefits, life and health
     
Postretirement Benefits      
Increase (decrease) in noncurrent liabilities to recognize changes in funded status of a defined benefit postretirement plan 77 56 (304)
Increase (decrease) in other comprehensive income to recognize changes in funded status of a defined benefit postretirement plan (48) (35) 188
Change in benefit obligation:      
Benefit obligation at beginning of year 426 389  
Actuarial loss 77 56  
Interest cost 17 18 30
Service cost 11 10 16
Benefits paid (4) (1)  
Amortization of actuarial gain (39) (46) (24)
Benefit obligation at end of year 488 426 389
Amounts that will be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year      
Estimated net actuarial gain 33    
Components of postretirement benefits expense (income)      
Service cost 11 10 16
Interest 17 18 30
Amortization of actuarial gain (39) (46) (24)
Total (income) expense (11) (18) 22
Other changes in benefit obligations recognized in other comprehensive loss:      
Actuarial loss (gain) 77 56 (304)
Total recognized in net periodic benefit expense (income) and other comprehensive loss 66 38 (282)
Health care cost      
Assumed health care cost trend utilized for next year (as a percent) 7.50%    
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 16    
Effect of one-percentage-point decrease on postretirement benefit obligation (14)    
Discount rate      
Discount rate used to compute accumulated postretirement benefit obligations (as a percent) 3.59% 4.50%  
Discount rates used to compute net periodic benefit expense (as a percent) 4.50% 5.23% 5.61%
Future benefit payment expected to be paid      
2013 11    
2014 12    
2015 12    
2016 15    
2017 16    
2018-2022 126    
Postretirement benefits, life and health | Retirees
     
Change in benefit obligation:      
Benefit obligation at end of year 16 19  
Postretirement benefits, life and health | Fully eligible active participants
     
Change in benefit obligation:      
Benefit obligation at end of year 273 184  
Postretirement benefits, life and health | Other active participants
     
Change in benefit obligation:      
Benefit obligation at end of year $ 199 $ 223