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Acquisition of Business (Summary of Fair Value of Assets Acquired and Liabilities Assumed - Nell's Family Market Store) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Oct. 30, 2016
Dec. 26, 2015
Business Acquisition [Line Items]      
Goodwill $ 52,330   $ 35,162
Nell's Family Market [Member]      
Business Acquisition [Line Items]      
Inventories   $ 401  
Prepaid expenses and other current assets   39  
Total current assets   440  
Property and equipment, net   8,625  
Goodwill   3,913  
Intangible and other assets, net   23  
Total fair value of assets acquired   13,001  
Accrued expenses   (3)  
Total current liabilities   (3)  
Total fair value of assets acquired and liabilties assumed   $ 12,998