Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.7.0.1
Summary of Significant Accounting Policies (Details)
ft² in Thousands
 6 Months Ended 12 Months Ended
Apr. 24, 2017
Jun. 29, 2017
ft²
state
segment
facility
Dec. 28, 2017
Dec. 29, 2016
Number of reportable segments | segment   1    
Number of states with facilities | state   17    
Number of distribution centers   4    
Fiscal year period       364 days
Fiscal quarter period   91 days    
Stock split conversion ratio 321.820      
Scenario, Forecast [Member]        
Fiscal year period     364 days  
Minimum        
Fiscal year period   364 days    
Maximum        
Fiscal year period   371 days    
Warehouse Format Store [Member]        
Number of stores   73    
Area of facility | ft²   72    
Small Format Store [Member]        
Number of stores   1