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

SCHEDULE I - Parent Company Information - Condensed Statements of Income (Details)

v3.8.0.1
SCHEDULE I - Parent Company Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2017
Sep. 29, 2016
Sep. 28, 2017
Sep. 29, 2016
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Condensed Financial Statements, Captions [Line Items]              
Income before income taxes $ 25,986 $ 22,168 $ 68,551 $ 41,644 $ 54,513 $ 43,006 $ 24,732
Benefit for income taxes 2,731 7,949 13,739 15,312 11,474 16,199 9,634
Net income $ 23,255 $ 14,219 $ 54,812 $ 26,332 43,039 26,807 15,098
Parent Company [Member]              
Condensed Financial Statements, Captions [Line Items]              
Net income from subsidiaries         43,039 26,807 15,098
Income before income taxes         43,039 26,807 15,098
Benefit for income taxes         0 0 0
Net income         $ 43,039 $ 26,807 $ 15,098