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NET INCOME PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Dec. 30, 2011
Sep. 30, 2011
Jul. 01, 2011
Apr. 01, 2011
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                      
Net income (in dollars) $ 7,400 $ 14,300 $ 10,300 $ 1,500 $ 7,600 $ 13,900 $ 8,600 $ 800 $ 33,629 $ 30,791 $ 19,839
Weighted average number of common shares used in basic net income per common share                 39,548,000 41,961,000 43,224,000
Dilutive effect of outstanding stock options and non-vested restricted stock                 400,000 300,000 300,000
Weighted average number of common shares used in diluted net income per common share                 39,862,000 42,322,000 43,540,000
Net income per common share:                      
Basic (in dollars per share) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 0.19 $ 0.33 $ 0.20 $ 0.02 $ 0.85 $ 0.73 $ 0.46
Diluted (in dollars per share) $ 0.19 $ 0.36 $ 0.26 $ 0.04 $ 0.19 $ 0.33 $ 0.20 $ 0.02 $ 0.84 $ 0.73 $ 0.46
Anti-dilutive shares                 700,000 1,000,000 1,000,000