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

Unaudited Earnings Per Share Pro Forma for Dividend (Details)

v3.8.0.1
Unaudited Earnings Per Share Pro Forma for Dividend (Details) - USD ($)
$ / shares in Units, $ 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
Jul. 25, 2017
May 02, 2017
Share price         $ 9.99     $ 40.00  
Net income $ 23,255 $ 14,219 $ 54,812 $ 26,332 $ 43,039 $ 26,807 $ 15,098    
Amount of dividends         225,000        
Excess of dividends over net income         $ (181,961)        
Number of shares required to be issued at $21.00 per share to pay excess of dividends over net income         8,664,810        
Basic weighted average shares outstanding 94,439,204 83,457,037 89,613,542 83,405,904 83,432,157 83,365,218 83,222,330    
Pro forma basic weighted average shares outstanding         92,096,967        
Pro forma basic earnings per share         $ 0.47        
Dilutive weighted average shares outstanding 103,899,602 88,368,689 98,065,809 88,252,191 88,430,987 86,280,907 85,651,749    
Pro forma dilutive weighted average shares outstanding         97,095,797        
Pro forma dilutive earnings per share         $ 0.44        
IPO | Class A Common Stock                  
Share price         $ 21.00       $ 21.00