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Shareholders' Equity: (Details 2) (Stock options, USD $)
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Number of Shares      
Outstanding at the beginning of the period (in shares) 668,614 644,220  
Granted (in shares) 120,000 93,000  
Exercised (in shares) (174,887) (68,606)  
Outstanding at the end of the period (in shares) 613,727 668,614 644,220
Exercisable at the end of the period (in shares) 351,463    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 24.31 $ 20.45  
Granted (in dollars per share) $ 54.26 $ 45.55  
Exercised (in dollars per share) $ 19.77 $ 16.85  
Outstanding at the end of the period (in dollars per share) $ 31.46 $ 24.31 $ 20.45
Exercisable at the end of the period (in dollars per share) $ 21.79    
Weighted Average Remaining Contractual Life (years)      
Outstanding 7 years 22 days 6 years 7 months 13 days 6 years 9 months 25 days
Exercisable at the end of the period 5 years 9 months 22 days    
Intrinsic Value      
Outstanding at the beginning of the period $ 22,101,800 $ 7,571,000  
Outstanding at the end of the period 16,010,000 22,101,800 7,571,000
Exercisable at the end of the period $ 12,568,600    
Weighted average assumptions and results used in estimation of fair value of options granted      
Risk free interest rate (as a percent) 0.88% 1.54%  
Expected life 6 years 6 years  
Expected volatility (as a percent) 31.90% 28.30%  
Dividend yield (as a percent) 2.05% 0.27%  
Option fair value (in dollars per share) $ 13.43 $ 13.35  
2001 Plan and 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%    
2001 Plan and 2010 Plan | Maximum
      
Stock option plans      
Term of the option 10 years    
2001 Plan
      
Stock option plans      
Number of shares authorized for issuance 750,000    
2010 Plan
      
Stock option plans      
Number of shares authorized for issuance 250,000    
Nonemployee Directors Plan
      
Stock option plans      
Number of shares authorized for issuance 300,000