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Acquisition of Business (Narrative) (Details)
$ in Thousands
2 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 12 Months Ended
Oct. 30, 2016
USD ($)
store
Aug. 01, 2016
USD ($)
store
Aug. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Oct. 30, 2016
USD ($)
store
site
Dec. 31, 2016
USD ($)
Sep. 24, 2016
USD ($)
Jun. 25, 2016
USD ($)
Mar. 26, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 26, 2015
USD ($)
Dec. 27, 2014
USD ($)
Acquisitions [Line Items]                            
Purchase price                       $ 63,632 $ 0 $ 0
Gain on bargain purchase           $ 23,879 $ 0 $ 0 $ 0     23,879 0 $ 0
Goodwill       $ 52,330   $ 52,330       $ 52,330 $ 52,330 $ 52,330 $ 35,162  
Mars Super Market [Member]                            
Acquisitions [Line Items]                            
Sales                     $ 38,000      
Number of stores acquired | store   5                        
Purchase price   $ 24,600                        
Goodwill   $ 13,255                        
Number of lease obligations assumed   2                        
Number of new lease agreements due to acquisition   2                        
Goodwill deductible for tax purposes   $ 13,300                        
Food Lion, LLC [Member]                            
Acquisitions [Line Items]                            
Sales                   $ 92,500        
Number of stores acquired | store         38                  
Number of owned stores acquired | site         8                  
Purchase price         $ 29,400                  
Gain on bargain purchase $ 23,879                          
Number of lease obligations assumed         30                  
Food Lion, LLC [Member] | MARYLAND                            
Acquisitions [Line Items]                            
Number of stores acquired | store         21                  
Food Lion, LLC [Member] | VIRGINIA                            
Acquisitions [Line Items]                            
Number of stores acquired | store         13                  
Food Lion, LLC [Member] | DELAWARE                            
Acquisitions [Line Items]                            
Number of stores acquired | store         4                  
Nell's Family Market [Member]                            
Acquisitions [Line Items]                            
Sales       $ 3,000                    
Number of stores acquired | store 1                          
Purchase price $ 13,000                          
Purchase price payable 3,400                          
Purchase price payable, term                       4 years    
Goodwill 3,913       $ 3,913                  
Goodwill deductible for tax purposes $ 3,900       $ 3,900                  
C&S Wholesale Grocers [Member]                            
Acquisitions [Line Items]                            
Purchase price     $ 7,900                      
Goodwill     0                      
Land     1,900                      
Buildings     5,900                      
Equipment     $ 112