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Shareholders' Equity: (Details) (USD $)
 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 25, 2012
Apr. 30, 2012
Jan. 31, 2012
Mar. 31, 2012
Sep. 29, 2012
Sep. 29, 2012
Stock options
Sep. 24, 2011
Stock options
Dec. 31, 2011
Stock options
Sep. 29, 2012
2001 Plan
Stock options
Sep. 29, 2012
2010 Plan
Stock options
Sep. 29, 2012
Nonemployee Directors Plan
Stock options
Dividends                      
Cash dividend approved by Board of Directors (in dollars per share) $ 0.04 $ 0.04 $ 0.03                
Special cash dividend approved by Board of Directors (in dollars per share)     $ 5.00                
Total special dividend in cash       $ 25,400,000              
Borrowings under the Line of Credit to finance special dividend       12,800,000              
Repurchase of Common Stock                      
Number of shares repurchased         92,652            
Aggregate purchase price of shares repurchased         4,900,000            
Aggregate purchase price per share of shares repurchased (in dollars per share)         $ 52.82            
Number of additional shares that can be repurchased         403,220            
Stock option plans                      
Number of shares authorized for issuance                 750,000 250,000 300,000
Number of Shares                      
Outstanding at the beginning of the period (in shares)           668,614          
Granted (in shares)           72,500          
Exercised (in shares)           (130,287)          
Outstanding at the end of the period (in shares)           610,827   668,614      
Exercisable at the end of the period (in shares)           341,938          
Weighted Average Exercise Price                      
Outstanding at the beginning of the period (in dollars per share)           $ 24.31          
Granted (in dollars per share)           $ 53.30          
Exercised (in dollars per share)           $ 20.12          
Outstanding at the end of the period (in dollars per share)           $ 28.65   $ 24.31      
Exercisable at the end of the period (in dollars per share)           $ 18.79          
Weighted Average Remaining Contractual Life (years)                      
Outstanding           6 years 10 months 6 days   6 years 7 months 13 days      
Exercisable at the end of the period           5 years 7 months 17 days          
Intrinsic Value                      
Outstanding at the beginning of the period           22,101,800          
Outstanding at the end of the period           15,616,100   22,101,800      
Exercisable at the end of the period           11,528,500          
Shares of previously owned common stock surrendered as payment for option shares exercised           31,351          
Weighted average assumptions and results used in estimation of fair value of options granted                      
Risk free interest rate (as a percent)           0.88% 1.94%        
Expected life           6 years 6 years        
Expected volatility (as a percent)           31.40% 28.00%        
Dividend yield (as a percent)           2.06% 0.32%        
Option fair value (in dollars per share)           $ 12.95 $ 11.28        
Additional disclosures                      
Compensation expense           683,000 552,800        
Total unrecognized compensation expense           $ 2,300,000          
Weighted average period for recognition of unrecognized compensation expense           2 years 4 months 24 days