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Summary of Significant Accounting Policies: (Details 4) (USD $)
 3 Months Ended 12 Months Ended
Jan. 01, 2013
Oct. 02, 2012
Jul. 03, 2012
Apr. 03, 2012
Jan. 03, 2012
Sep. 27, 2011
Jun. 28, 2011
Mar. 29, 2011
Jan. 01, 2013
Jan. 03, 2012
Dec. 28, 2010
Advertising Costs                      
Advertising costs                 $ 5,800,000 $ 6,200,000 $ 7,300,000
Income Taxes                      
Threshold for recognition of uncertain income tax position, minimum (as a percent)                 50.00%    
Net income per share, basic and diluted                      
Net income $ 22,139,000 $ 27,163,000 $ 11,733,000 $ 20,722,000 $ 29,942,000 $ 20,574,000 $ 24,748,000 $ 20,456,000 $ 98,423,000 $ 95,720,000 $ 81,713,000
Basic weighted average shares outstanding                 53,185,000 56,378,000 58,905,000
Dilutive effect of equity awards (in shares)                 2,026,000 1,812,000 1,541,000
Diluted weighted average shares outstanding                 55,211,000 58,190,000 60,446,000
Basic net income per share (in dollars per share) $ 0.42 $ 0.51 $ 0.53 $ 0.39 $ 0.55 $ 0.37 $ 0.44 $ 0.35 $ 1.85 $ 1.70 $ 1.39
Diluted net income per share (in dollars per share) $ 0.40 $ 0.49 $ 0.52 $ 0.37 $ 0.54 $ 0.36 $ 0.42 $ 0.34 $ 1.78 $ 1.64 $ 1.35
Shares of common stock not included in the diluted calculation due to their anti-dilutive effect                 2,900,000 3,400,000 4,400,000
Restricted Shares and Restricted Share Units
                      
Net Income Per Share                      
Unvested shares of restricted stock issued to employees 1,316,000       826,000       1,316,000 826,000 500,000