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Receivables (Details) (USD $)
 12 Months Ended
Dec. 25, 2013
Dec. 26, 2012
Dec. 28, 2011
Receivables [Abstract]      
Trade accounts receivable from franchisees $ 10,072,000 $ 10,212,000  
Notes receivable from franchisees and third parties 1,800,000 4,310,000  
Allowance for doubtful accounts (231,000) (12,000)  
Receivables 17,321,000 19,947,000  
Noncurrent assets (included as a component of other noncurrent assets):      
Notes receivable from franchisees 766,000 1,002,000  
Maximum provision for credit losses 100,000 100,000  
Interest income on notes receivables 100,000 100,000 200,000
Vendor receivables [Member]
      
Receivables [Abstract]      
Other receivable, gross, current 2,516,000 2,529,000  
Credit card receivables [Member]
      
Receivables [Abstract]      
Other receivable, gross, current 2,162,000 1,384,000  
Other [Member]
      
Receivables [Abstract]      
Other receivable, gross, current $ 1,002,000 $ 1,524,000