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

Debt Other (Details)

v3.8.0.1
Debt Other (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 02, 2017
Mar. 31, 2017
Sep. 28, 2017
Mar. 30, 2017
Sep. 29, 2016
Sep. 28, 2017
Sep. 29, 2016
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Jul. 25, 2017
Debt Instrument, Face Amount   $ 350,000                  
Share Price               $ 9.99     $ 40.00
Repayments of Secured Debt $ 192,000         $ 196,625 $ 900 $ 98,334 $ 1,667 $ 1,467  
Gain (Loss) on Extinguishment of Debt     $ 0   $ 0 $ (5,442) $ (153) $ (1,813) $ 0 $ 0  
IPO                      
Stock Issued During Period, Shares, New Issues 10,147,025                    
Proceeds from Issuance Initial Public Offering $ 192,000                    
IPO | Class A Common Stock                      
Stock Issued During Period, Shares, New Issues 10,147,025                    
Share Price $ 21.00             $ 21.00      
Base Rate [Member] | Maximum                      
Debt Instrument, Basis Spread on Variable Rate   2.50%   3.25%              
Base Rate [Member] | Minimum                      
Debt Instrument, Basis Spread on Variable Rate   2.00%   2.75%              
London Interbank Offered Rate (LIBOR) [Member]                      
Debt Instrument Variable Rate Floor   1.00%                  
London Interbank Offered Rate (LIBOR) [Member] | Maximum                      
Debt Instrument, Basis Spread on Variable Rate   3.50%   4.25%              
London Interbank Offered Rate (LIBOR) [Member] | Minimum                      
Debt Instrument, Basis Spread on Variable Rate   3.00%   3.75%