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Stockholders' Equity: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Jan. 01, 2013
Oct. 02, 2012
Jan. 01, 2013
Jan. 03, 2012
Dec. 28, 2010
Jan. 01, 2013
Treasury Stock
Jan. 03, 2012
Treasury Stock
Dec. 28, 2010
Treasury Stock
Oct. 17, 2011
Treasury Stock
Oct. 17, 2011
Treasury Stock
Maximum
Stockholders Equity:                    
Additional number of shares authorized to repurchase                 10,000,000  
Shares authorized to repurchase                   41,000,000
Repurchased shares since program inception 34,414,222   34,414,222 31,196,128            
Value of shares repurchased since program inception $ 831,814   $ 831,814 $ 730,422   $ 730,400        
Shares repurchased during period           3,200,000 6,000,000 2,100,000    
Treasury stock repurchased during period     101,392 172,126 52,088 101,400 172,100 52,100    
Dividends declared (in dollars per share) $ 0.12 $ 0.12 $ 0.24              
Cash dividend declared $ 12,900 $ 12,900 $ 12,762