Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details)
ft² in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 24, 2017
Sep. 28, 2017
ft²
facility
state
Sep. 28, 2017
ft²
facility
state
segment
Dec. 28, 2017
Dec. 29, 2016
Number of reportable segments | segment     1    
Number of states with facilities | state   20 20    
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   80 80    
Area of facility | ft²   73 73    
Small Format Store [Member]          
Number of stores   1 1