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Related Party Transactions (Details) - Franchise
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
restaurant
Jul. 01, 2014
USD ($)
restaurant
Jun. 30, 2015
USD ($)
restaurant
Jul. 01, 2014
USD ($)
restaurant
Nov. 25, 2014
Related Party Transactions          
Number of franchise restaurants owned, in whole or part, by certain of entity's officers, directors or 5% shareholders 80 75 80 75  
Minority-owned          
Related Party Transactions          
Number of franchise restaurants owned, in whole or part, by certain of entity's officers, directors or 5% shareholders 24 23 24 23  
Ownership percentage by entity         5.00%
Officers, directors and shareholders          
Related Party Transactions          
Number of franchise restaurants owned, in whole or part, by certain of entity's officers, directors or 5% shareholders 10 15 10 15  
Fees received from franchise and license restaurants | $ $ 0.5 $ 0.6 $ 0.9 $ 1.3  
Number of restaurants for which the entity is contingently liable on the lease     3