General form of registration statement for all companies including face-amount certificate companies

Summary of Significant Accounting Policies (Details)

v3.7.0.1
Summary of Significant Accounting Policies (Details)
ft² in Thousands
 3 Months Ended 12 Months Ended
Apr. 24, 2017
Mar. 30, 2017
ft²
state
segment
facility
Dec. 28, 2017
Dec. 29, 2016
ft²
state
segment
facility
Dec. 31, 2015
Dec. 25, 2014
Number of reportable segments | segment   1   1    
Number of states with facilities | state   17   17    
Number of distribution centers   4   4    
Fiscal year period       364 days 371 days 364 days
Fiscal quarter period   91 days        
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   72   69    
Area of facility | ft²   72   72    
Small Format Store [Member]            
Number of stores   1   1    
Subsequent Event            
Stock split conversion ratio 321.820