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Shareholders' Equity (Deficit): Stock Options Activity (Details) - Stock options - USD ($)
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Number of Shares        
Outstanding at the beginning of the period (in shares) 658,184 673,670 668,740  
Granted (in shares) 69,000 69,500 69,600  
Exercised (in shares) (79,241) (80,236) (61,169)  
Forfeited (in shares) (8,563) (4,750) (3,501)  
Outstanding at the end of the period (in shares) 639,380 658,184 673,670 668,740
Exercisable at the end of the period (in shares) 472,105      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 72.33 $ 62.11 $ 53.73  
Granted (in dollars per share) 149.51 128.00 112.07  
Exercised (in dollars per share) 39.37 33.41 26.21  
Forfeited (in dollars per share) 119.24 95.28 80.31  
Outstanding at the end of the period (in dollars per share) 84.12 $ 72.33 $ 62.11 $ 53.73
Exercisable at the end of the period (in dollars per share) $ 67.95      
Weighted Average Remaining Contractual Life (years)        
Outstanding 5 years 7 months 10 days 5 years 10 months 13 days 6 years 1 month 10 days 6 years 4 months 28 days
Exercisable at the end of the period 4 years 6 months 18 days      
Intrinsic Value        
Outstanding at the beginning of the period $ 37,723,800 $ 43,139,100 $ 25,582,300  
Outstanding at the end of the period 47,808,100 $ 37,723,800 $ 43,139,100 $ 25,582,300
Exercisable at the end of the period $ 42,932,300      
Weighted average assumptions and results used in estimation of fair value of options granted        
Risk free interest rate (as a percent) 2.73% 2.05% 1.80%  
Expected life (years) 6 years 6 years 6 years  
Expected volatility (as a percent) 19.94% 25.64% 27.13%  
Dividend yield (as a percent) 1.13% 1.10% 1.23%  
Option fair value (in dollars per share) $ 32.45 $ 32.07 $ 28.54