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

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details)
ft² in Thousands
9 Months Ended 12 Months Ended
Sep. 28, 2017
ft²
state
segment
facility
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 20 17    
Number of distribution centers   4    
Fiscal year period   364 days 371 days 364 days
Warehouse Format Store [Member]        
Number of stores 80 69    
Area of facility | ft² 73 72    
Small Format Store [Member]        
Number of stores 1 1