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Acquisition of Business (Summary of Fair Value of Assets Acquired and Liabilities Assumed - Mars Super Market Stores) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Aug. 01, 2016
Dec. 26, 2015
Business Acquisition [Line Items]      
Goodwill $ 52,330   $ 35,162
Mars Super Market [Member]      
Business Acquisition [Line Items]      
Inventories   $ 1,267  
Accounts receivable and prepaid expenses   248  
Property and equipment   7,305  
Goodwill   13,255  
Intangibles - favorable leasehold interest, net   2,495  
Total fair value of assets acquired   $ 24,570