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Quarterly Financial Data (unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 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
Quarterly Financial Data (unaudited)                      
Revenues $ 464,695 $ 453,819 $ 454,749 $ 435,754 $ 477,696 $ 430,417 $ 430,746 $ 418,765 $ 1,809,017 $ 1,757,624 $ 1,659,404
Income/(loss) from operations 28,186 39,324 40,970 30,219 38,183 30,254 35,162 29,851 138,699 133,450 128,211
Net income/(loss) 22,139 27,163 11,733 20,722 29,942 20,574 24,748 20,456 98,423 95,720 81,713
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
Dividends declared (in dollars per share) $ 0.12 $ 0.12             $ 0.24    
Proceeds from a variable life insurance contract     $ 419                
Length of fiscal quarter 91 days 91 days 91 days 91 days 98 days 91 days 91 days 91 days