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Impairment and Closure Costs (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 27, 2011
restaurant
Dec. 28, 2010
restaurant
Dec. 27, 2011
restaurant
Dec. 28, 2010
restaurant
Dec. 29, 2009
Impairment and Closure Costs          
Impairment charges related to goodwill and long-lived assets     $ 1,201,000 $ 2,005,000 $ 3,000,000
Impairment of goodwill 800,000 1,680,000 839,000 1,680,000  
Number of restaurants 366 345 366 345  
Underperforming restaurant
         
Impairment and Closure Costs          
Impairment of goodwill         1,900,000
Number of restaurants         4
Impairment charge nondeductible for tax purposes         600,000
Impairment charges related to underperforming restaurants         1,300,000
Number of restaurants with asset impairments         1
Relocated restaurant
         
Impairment and Closure Costs          
Number of restaurants         1
Goodwill impairment
         
Impairment and Closure Costs          
Impairment of goodwill       1,680,000  
Number of restaurants 1 4 1 4  
Restaurant closed in 2010
         
Impairment and Closure Costs          
Number of restaurants   1   1  
Ongoing closure costs       200,000  
Restaurant closed in 2008
         
Impairment and Closure Costs          
Number of restaurants 1 1 1 1  
Ongoing closure costs       100,000 500,000
Credit recognized related to settlement of a lease reserve         $ 100,000