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Shareholders' Equity (Deficit): Stock Options Activity (Details) - Stock options - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Number of Shares        
Outstanding at the beginning of the period (in shares) 673,670 668,740 597,700  
Granted (in shares) 69,500 69,600 79,400  
Exercised (in shares) (80,236) (61,169) (8,360)  
Forfeited (in shares) (4,750) (3,501)    
Outstanding at the end of the period (in shares) 658,184 673,670 668,740 597,700
Exercisable at the end of the period (in shares) 476,780      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 62.11 $ 53.73 $ 48.50  
Granted (in dollars per share) 128.00 112.07 91.46  
Exercised (in dollars per share) 33.41 26.21 38.46  
Forfeited (in dollars per share) 95.28 80.31    
Outstanding at the end of the period (in dollars per share) 72.33 $ 62.11 $ 53.73 $ 48.50
Exercisable at the end of the period (in dollars per share) $ 58.41      
Weighted Average Remaining Contractual Life (years)        
Outstanding 5 years 10 months 13 days 6 years 1 month 10 days 6 years 4 months 28 days 6 years 11 months 5 days
Exercisable at the end of the period 4 years 10 months 2 days      
Intrinsic Value        
Outstanding at the beginning of the period $ 43,139,100 $ 25,582,300 $ 20,973,700  
Outstanding at the end of the period 37,723,800 $ 43,139,100 $ 25,582,300 $ 20,973,700
Exercisable at the end of the period $ 33,845,900      
Weighted average assumptions and results used in estimation of fair value of options granted        
Risk free interest rate (as a percent) 2.05% 1.80% 1.71%  
Expected life (years) 6 years 6 years 6 years  
Expected volatility (as a percent) 25.64% 27.13% 30.15%  
Dividend yield (as a percent) 1.10% 1.23% 1.36%  
Option fair value (in dollars per share) $ 32.07 $ 28.54 $ 24.88