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Shareholders' Equity (Deficit): Stock Options Activity (Details) - Stock options - USD ($)
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Number of Shares        
Outstanding at the beginning of the period (in shares) 479,558 639,380 658,184  
Granted (in shares) 45,100 54,800 69,000  
Exercised (in shares) (108,170) (190,172) (79,241)  
Forfeited (in shares) (23,000) (24,450) (8,563)  
Outstanding at the end of the period (in shares) 393,488 479,558 639,380 658,184
Exercisable at the end of the period (in shares) 280,908      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 101.78 $ 84.12 $ 72.33  
Granted (in dollars per share) 163.87 170.14 149.51  
Exercised (in dollars per share) 76.29 57.41 39.37  
Forfeited (in dollars per share) 148.16 138.13 119.24  
Outstanding at the end of the period (in dollars per share) 113.19 $ 101.78 $ 84.12 $ 72.33
Exercisable at the end of the period (in dollars per share) $ 94.80      
Weighted Average Remaining Contractual Life (years)        
Outstanding 5 years 7 months 9 days 5 years 9 months 14 days 5 years 7 months 9 days 5 years 10 months 13 days
Exercisable at the end of the period 4 years 4 months 20 days      
Intrinsic Value        
Outstanding at the beginning of the period $ 45,283,200 $ 47,808,100 $ 37,723,800  
Outstanding at the end of the period 27,864,900 $ 45,283,200 $ 47,808,100 $ 37,723,800
Exercisable at the end of the period $ 25,059,600      
Weighted average assumptions and results used in estimation of fair value of options granted        
Risk free interest rate (as a percent) 0.45% 1.85% 2.73%  
Expected life (years) 6 years 6 years 6 years  
Expected volatility (as a percent) 25.03% 19.30% 19.94%  
Dividend yield (as a percent) 2.33% 1.38% 1.13%  
Option fair value (in dollars per share) $ 28.25 $ 30.96 $ 32.45