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Deferred Compensation (Details) (USD $)
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Deferred Compensation      
Liability under the Deferred Plan, post-retirement medical benefits and other deferred compensation arrangements $ 300,000 $ 500,000  
Deferred compensation expense 2,000 19,000 42,000
Deferred Plan
     
Deferred Compensation      
Reference rate 10-year treasury rate    
Vesting percentage of previous employer accruals and employee contributions 100.00%    
Period of distributions to participants 120 months    
Period for which distributions are not allowed to key employees after separation from service 6 months    
Period of termination after change in control for payments to be made to participants 12 months    
Deferred Plan | Minimum
     
Deferred Compensation      
Interest rate margin (as a percent) 1.00%    
Deferred Plan | Maximum
     
Deferred Compensation      
Interest rate margin (as a percent) 3.00%    
Active executives contributions as percentage of their annual base pay 50.00%    
Percentage of incentive bonus that the active executives can contribute 100.00%    
Post-retirement medical benefit plan
     
Deferred Compensation      
Decline in future benefit obligation   $ 400,000