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

Stockholders' Equity (Stock Options) (Details)

v3.8.0.1
Stockholders' Equity (Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Apr. 13, 2017
Sep. 28, 2017
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Jul. 25, 2017
Dec. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options authorized for grant 5,000,000   12,520,407 10,780,970      
Options available for grant     179,575 104,269      
Options              
Outstanding at the beginning of period   11,979,111 10,460,119 9,524,266 10,714,356    
Granted 1,254,465 1,272,156 2,025,535 1,378,355 748,553    
Exercised   (1,004,322) (145,140) (5,149) (201,137)    
Forfeited or expired   (159,687) (361,403) (437,353) (1,737,506)    
Outstanding at the end of period   12,087,258 11,979,111 10,460,119 9,524,266    
Weighted Average Exercise Price              
Outstanding at the beginning of period   $ 5.34 $ 4.77 $ 4.40 $ 4.09    
Granted     9.94 8.07 7.69    
Exercised     3.48 7.69 3.28    
Forfeited or expired     6.65 7.16 4.06    
Outstanding at the end of period     $ 5.34 $ 4.77 $ 4.40    
Additional Disclosures              
Options Exercisable at End of Year     8,151,056 6,656,524 4,608,462   3,471,150
Weighted Average Exercise Price of Exercisable Options     $ 4.20 $ 4.00 $ 3.85   $ 3.64
Weighted Average Fair Value/Share of Options Granted During the Year     4.13 $ 4.12 $ 3.72    
Share price     $ 9.99     $ 40.00  
Options exercised, intrinsic value     $ 942 $ 11      
Options outstanding, aggregate intrinsic value     $ 55,759        
Options outstanding, weighted-average remaining contractual life     6 years 2 months 12 days        
Options exercisable, aggregate intrinsic value     $ 47,218        
Options exercisable, weighted-average remaining contractual life     5 years 1 month 6 days        
Unrecognized compensation cost amount     $ 12,577        
Unrecognized compensation cost period for recognition     3 years 10 months 24 days        
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Risk free interest rate     1.43% 1.93% 2.09%    
Expected volatility     40.00% 49.00% 46.00%    
Expected life (in years)     6 years 6 months 6 years 11 months 1 day 6 years 5 months 27 days    
Dividend yield     0.00% 0.00% 0.00%