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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 27, 2012
Jun. 26, 2012
item
supplier
restaurant
Dec. 27, 2011
Commitments and Contingencies      
Estimated cost to complete capital project commitments (in dollars)   $ 42.0 $ 58.6
Ownership percentage   5.00%  
Number of suppliers providing most of the company's beef   4  
Minimum age specified in age discrimination allegation against entity   40 years  
Number of motions filed by the entity in response to a complaint filed by the EEOC   2  
Number of motions filed by the entity to dismiss a case filed by the EEOC   1  
Number of motions filed by the entity to transfer a case filed by the EEOC   1  
Number of restaurants operated in Massachusetts   9  
Settlement expense $ 5.0