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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. 29, 2018
Dec. 30, 2017
Aug. 01, 2016
Business Acquisition [Line Items]      
Goodwill $ 52,330 $ 52,330  
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