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Receivables (Details) (USD $)
 12 Months Ended
Dec. 26, 2012
Dec. 28, 2011
Dec. 29, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on notes receivables $ 100,000 $ 200,000 $ 300,000
Receivables [Abstract]      
Allowance for doubtful accounts (12,000) (8,000)  
Receivables 19,947,000 14,971,000  
Noncurrent assets (included as a component of other noncurrent assets):      
Notes receivable from franchisees 1,002,000 560,000  
Trade accounts receivable from franchisees [Member]
      
Receivables [Abstract]      
Receivable, gross 10,212,000 9,452,000  
Notes receivable from franchisees and third parties [Member]
      
Receivables [Abstract]      
Receivable, gross 4,310,000 992,000  
Vendor receivables [Member]
      
Receivables [Abstract]      
Receivable, gross 2,529,000 2,311,000  
Credit card receivables [Member]
      
Receivables [Abstract]      
Receivable, gross 1,384,000 1,137,000  
Other [Member]
      
Receivables [Abstract]      
Receivable, gross 1,524,000 1,087,000  
Maximum [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Provisions for credit losses $ 100,000 $ 100,000