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

Debt - Summary of Long-term Debt (Details)

v3.8.0.1
Debt - Summary of Long-term Debt (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Mar. 31, 2017
Sep. 28, 2017
Sep. 29, 2016
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Debt Instrument [Line Items]            
Total debt at par value   $ 191,475   $ 400,000 $ 179,233  
Less: current maturities       3,500 1,267  
Long-term debt maturities       396,500 177,966  
Less: unamortized discount and debt issuance costs   4,056   9,257 1,643  
Total long-term debt       387,243 176,323  
Term loan face amount $ 350,000          
Debt issuance costs   $ 993 $ 199 10,546 93 $ 208
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
LIBOR floor (as a percent) 1.00%          
Term Loan Facility            
Debt Instrument [Line Items]            
Total debt at par value       $ 350,000 0  
Interest Rate per Annum       5.25%    
Debt issuance costs       $ 10,347    
Quarterly repayment amount       $ 875    
LIBOR floor (as a percent)       1.00%    
Term Loan Facility | Base Rate [Member]            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)       3.25%    
Term Loan Facility | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)       4.25%    
Term Loan Facility | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)       0.50%    
ABL Facility            
Debt Instrument [Line Items]            
Total debt at par value       $ 50,000 92,900  
Interest Rate per Annum       2.08%    
Term loan face amount       $ 200,000    
Loss on extinguishment of debt       $ (162)    
LIBOR floor (as a percent)       1.00%    
ABL Facility | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Variable interest rate (as a percent)       0.50%    
Prior Term Loan Facility            
Debt Instrument [Line Items]            
Total debt at par value       $ 0 8,333  
Interest Rate per Annum       3.30%    
Prior Term Loan Facility And GCI Facility            
Debt Instrument [Line Items]            
Loss on extinguishment of debt       $ 1,319    
GCI Facility            
Debt Instrument [Line Items]            
Total debt at par value       $ 0 $ 78,000  
Interest Rate per Annum       7.75%