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Shareholders' Equity: (Details 2) (Stock options, USD $)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Number of Shares        
Outstanding at the beginning of the period (in shares) 613,727 668,614 644,220  
Granted (in shares) 96,250 120,000 93,000  
Exercised (in shares) (176,700) (174,887) (68,606)  
Forfeited (in shares) (6,565)      
Outstanding at the end of the period (in shares) 526,712 613,727 668,614 644,220
Exercisable at the end of the period (in shares) 273,887      
Weighted Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) $ 31.46 $ 24.31 $ 20.45  
Granted (in dollars per share) $ 71.39 $ 54.26 $ 45.55  
Exercised (in dollars per share) $ 18.82 $ 19.77 $ 16.85  
Forfeited (in dollars per share) $ 42.20      
Outstanding at the end of the period (in dollars per share) $ 42.87 $ 31.46 $ 24.31 $ 20.45
Exercisable at the end of the period (in dollars per share) $ 29.65      
Weighted Average Remaining Contractual Life (years)        
Outstanding 7 years 3 months 29 days 7 years 22 days 6 years 7 months 13 days 6 years 9 months 25 days
Exercisable at the end of the period 6 years 1 month 13 days      
Intrinsic Value        
Outstanding at the beginning of the period $ 16,010,000 $ 22,101,800 $ 7,571,000  
Outstanding at the end of the period 26,446,700 16,010,000 22,101,800 7,571,000
Exercisable at the end of the period $ 17,372,800      
Weighted average assumptions and results used in estimation of fair value of options granted        
Risk free interest rate (as a percent) 1.60% 0.88% 1.54%  
Expected life 6 years 6 years 6 years  
Expected volatility (as a percent) 32.90% 31.90% 28.30%  
Dividend yield (as a percent) 1.65% 2.05% 0.27%  
Fair value per option granted (in dollars per share) $ 20.36 $ 13.43 $ 13.35  
2001 Plan
        
Stock option plans        
Number of shares authorized for issuance 750,000      
2001 Plan | Minimum
        
Stock option plans        
Exercise price of stock options as a percentage of fair value on the date of grant 100.00%      
2010 Plan
        
Stock option plans        
Number of shares authorized for issuance 250,000      
2010 Plan | Minimum
        
Stock option plans        
Exercise price of stock options as a percentage of fair value on the date of grant 100.00%      
Threshold voting rights above which the option exercise price may not be less than 110% of the fair market value (as a percent) 10.00%      
Exercise price of stock options as a percentage of fair value on the date of grant for an individual who owns more than 10% of voting rights 110.00%      
2010 Plan | Maximum
        
Stock option plans        
Term of the option 10 years      
Nonemployee Directors Plan
        
Stock option plans        
Number of shares authorized for issuance 300,000