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Shareholders' Equity (Deficit): (Details) - USD ($)
 6 Months Ended
May. 13, 2015
Apr. 29, 2015
Apr. 15, 2015
Jan. 28, 2015
Jun. 27, 2015
Jun. 28, 2014
Repurchase of Common Stock            
Treasury Stock, Shares, Acquired         875,000  
Value of shares repurchased         $ 74,261,500 $ 7,186,800
Dividends            
Cash dividend approved by Board of Directors (in dollars per share)   $ 0.07   $ 0.06    
Tender Offer            
Repurchase of Common Stock            
Number of shares authorized     $ 875,000      
Purchase Of Stock Price Per Share     $ 84.72      
Treasury Stock, Shares, Acquired 875,000          
Common Stock Repurchase Program            
Repurchase of Common Stock            
Number of additional shares that can be repurchased         166,700