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Shareholders' Equity: (Details 2) (Stock options, USD $)
 3 Months Ended 12 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Dec. 29, 2012
Number of Shares      
Outstanding at the beginning of the period (in shares) 613,727    
Exercised (in shares) (7,944)    
Outstanding at the end of the period (in shares) 605,783   613,727
Exercisable at the end of the period (in shares) 343,519    
Granted (in shares) 0 0  
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 31.46    
Exercised (in dollars per share) $ 15.18    
Outstanding at the end of the period (in dollars per share) $ 31.68   $ 31.46
Exercisable at the end of the period (in dollars per share) $ 21.94    
Weighted Average Remaining Contractual Life (years)      
Outstanding 6 years 9 months 22 days   7 years 22 days
Exercisable at the end of the period 5 years 6 months 18 days    
Intrinsic Value      
Outstanding at the beginning of the period $ 16,010,000    
Outstanding at the end of the period 18,968,900   16,010,000
Exercisable at the end of the period $ 14,100,800    
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