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Shareholders' Equity: (Details 2) (Stock options, USD $)
 9 Months Ended 12 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Dec. 29, 2012
Number of Shares      
Outstanding at the beginning of the period (in shares) 613,727    
Granted (in shares) 47,500    
Exercised (in shares) (168,462)    
Forfeited (in shares) (6,565)    
Outstanding at the end of the period (in shares) 486,200   613,727
Exercisable at the end of the period (in shares) 236,064    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 31.46    
Granted (in dollars per share) $ 59.77    
Exercised (in dollars per share) $ 18.72    
Forfeited (in dollars per share) $ 42.20    
Outstanding at the end of the period (in dollars per share) $ 38.50   $ 31.46
Exercisable at the end of the period (in dollars per share) $ 27.15    
Weighted Average Remaining Contractual Life (years)      
Outstanding 7 years 3 months 11 days   7 years 22 days
Exercisable at the end of the period 6 years 25 days    
Intrinsic Value      
Outstanding at the beginning of the period $ 16,010,000    
Outstanding at the end of the period 17,358,000   16,010,000
Exercisable at the end of the period $ 11,107,300    
Weighted average assumptions and results used in estimation of fair value of options granted      
Risk free interest rate (as a percent) 1.30% 0.88%  
Expected life 6 years 6 years  
Expected volatility (as a percent) 32.50% 31.40%  
Dividend yield (as a percent) 1.90% 2.06%  
Option fair value (in dollars per share) $ 15.84 $ 12.95  
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