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Basis of Presentation (Details)
3 Months Ended 6 Months Ended
Jun. 26, 2012
restaurant
Jun. 28, 2011
restaurant
Jun. 26, 2012
restaurant
Jun. 28, 2011
restaurant
Basis of Presentation        
Threshold percentage of ownership for consolidated subsidiaries 50.00% 50.00% 50.00% 50.00%
Percentage of ownership interest in unconsolidated affiliate franchise restaurants, low end of range 5.00% 5.00% 5.00% 5.00%
Percentage of ownership interest in unconsolidated affiliate franchise restaurants, high end of range 10.00% 10.00% 10.00% 10.00%
Number of unconsolidated affiliate franchise restaurants 22 21 22 21