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

Summary of Significant Accounting Policies - Loss on Early Extinguishment of Debt (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Loss on Early Extinguishment of Debt (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 28, 2017
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Loss on Early Extinguishment of Debt        
Payments of Debt Extinguishment Costs   $ 179 $ 0 $ 0
Prior Term Loan Facility        
Loss on Early Extinguishment of Debt        
Payments of Debt Extinguishment Costs   179    
Extinguishment of Debt, Amount   19,833    
Write-off of deferred debt issuance costs on extinguishment of debt   153    
Prior Term Loan Facility And GCI Facility        
Loss on Early Extinguishment of Debt        
Write-off of deferred debt issuance costs on extinguishment of debt   1,319    
ABL Facility        
Loss on Early Extinguishment of Debt        
Write-off of deferred debt issuance costs on extinguishment of debt   $ 162    
Minimum        
Stock-Based Compensation        
Period of vesting provision 3 years 3 years    
Maximum        
Stock-Based Compensation        
Period of vesting provision 5 years 5 years