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

Debt - Fair Value of Debt (Details)

v3.8.0.1
Debt - Fair Value of Debt (Details) - USD ($)
$ in Thousands
Sep. 28, 2017
Dec. 29, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total debt at par value $ 191,475 $ 400,000 $ 179,233
Less: unamortized discount and debt issuance costs 4,056 9,257 1,643
Net carrying amount 187,419 390,743 177,590
Level 3      
Debt Instrument [Line Items]      
Fair value $ 191,858 $ 400,000 $ 179,413