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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2011
supplier
y
restaurant
Dec. 28, 2010
Commitments and Contingencies    
Estimated cost to complete capital project commitments (in dollars) $ 58.6 $ 52.8
Ownership percentage (as a percent) 5.00%  
Number of suppliers providing most of the company's beef 3  
Minimum age specified in age discrimination allegation against entity (in years) 40  
Number of restaurants operated in Massachusetts 9