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Summary of Significant Accounting Policies (Details 4)
Dec. 30, 2014
restaurant
Dec. 31, 2013
restaurant
Segment Reporting    
Number of restaurants 451us-gaap_NumberOfRestaurants 420us-gaap_NumberOfRestaurants
Company-owned    
Segment Reporting    
Number of restaurants 372us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember		 346us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_EntityOperatedUnitsMember
Franchise    
Segment Reporting    
Number of restaurants 79us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember		 74us-gaap_NumberOfRestaurants
/ us-gaap_FranchisorDisclosureAxis
= us-gaap_FranchisedUnitsMember