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Shareholders' Equity: (Details 3) (Stock options, USD $)
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Options Outstanding      
Number Outstanding (in shares) 526,712    
Weighted Average Remaining Contractual Life 7 years 3 months 29 days    
Weighted Average Exercise Price (in dollars per share) $ 42.87    
Options Exercisable      
Number Exercisable (in shares) 273,887    
Weighted Average Exercise Price (in dollars per share) $ 29.65    
Additional disclosures      
Total intrinsic value of options exercised $ 8,700,000 $ 7,400,000 $ 1,800,000
Total fair value of shares vested 3,900,000 2,800,000 2,200,000
Shares of previously owned common stock surrendered as payment for option shares exercised 1,207 31,351 2,208
Compensation expense 1,153,600 930,200 755,700
Total unrecognized compensation expense $ 3,400,000    
Weighted average period for recognition of unrecognized compensation expense 2 years 7 months 6 days    
$12.75 - $18.40
      
Stock options outstanding and exercisable      
Range of Exercise Price, low end of range (in dollars per share) $ 12.75    
Range of Exercise Price, high end of range (in dollars per share) $ 18.40    
Options Outstanding      
Number Outstanding (in shares) 64,636    
Weighted Average Remaining Contractual Life 5 years 14 days    
Weighted Average Exercise Price (in dollars per share) $ 13.84    
Options Exercisable      
Number Exercisable (in shares) 64,636    
Weighted Average Exercise Price (in dollars per share) $ 13.84    
$20.32 - $31.19
      
Stock options outstanding and exercisable      
Range of Exercise Price, low end of range (in dollars per share) $ 20.32    
Range of Exercise Price, high end of range (in dollars per share) $ 31.19    
Options Outstanding      
Number Outstanding (in shares) 115,326    
Weighted Average Remaining Contractual Life 5 years 3 months 22 days    
Weighted Average Exercise Price (in dollars per share) $ 25.37    
Options Exercisable      
Number Exercisable (in shares) 103,449    
Weighted Average Exercise Price (in dollars per share) $ 24.70    
$32.92 - $51.17
      
Stock options outstanding and exercisable      
Range of Exercise Price, low end of range (in dollars per share) $ 32.92    
Range of Exercise Price, high end of range (in dollars per share) $ 51.17    
Options Outstanding      
Number Outstanding (in shares) 134,250    
Weighted Average Remaining Contractual Life 7 years 7 months 6 days    
Weighted Average Exercise Price (in dollars per share) $ 40.80    
Options Exercisable      
Number Exercisable (in shares) 65,618    
Weighted Average Exercise Price (in dollars per share) $ 37.72    
$53.34 - $82.72
      
Stock options outstanding and exercisable      
Range of Exercise Price, low end of range (in dollars per share) $ 53.34    
Range of Exercise Price, high end of range (in dollars per share) $ 82.72    
Options Outstanding      
Number Outstanding (in shares) 212,500    
Weighted Average Remaining Contractual Life 8 years 11 months 16 days    
Weighted Average Exercise Price (in dollars per share) $ 62.51    
Options Exercisable      
Number Exercisable (in shares) 40,184    
Weighted Average Exercise Price (in dollars per share) $ 54.65