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

Stockholders' Equity (Stock Options) (Details)

v3.7.0.1
Stockholders' Equity (Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 30, 2017
Dec. 29, 2016
Dec. 31, 2015
Dec. 25, 2014
Dec. 26, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options authorized for grant   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 0 2,025,535 1,378,355 748,553  
Exercised (16,728) (145,140) (5,149) (201,137)  
Forfeited or expired (70,483) (361,403) (437,353) (1,737,506)  
Outstanding at the end of period 11,891,900 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      
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%