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GOODWILL AND INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) (USD $)
 12 Months Ended
Dec. 27, 2013
Goodwill, gross  
Balance at December 28, 2012 $ 94,300,000
Goodwill acquired year to date 34,100,000 [1]
Balance at December 27, 2013 128,400,000
Accumulated Impairment Losses  
Balance at December 28, 2012 (46,200,000)
Balance at December 27, 2013 (46,200,000)
Goodwill  
Balance at December 28, 2012 48,079,000
Goodwill acquired year to date 34,100,000 [1]
Balance at December 27, 2013 $ 82,239,000
[1] Goodwill acquired includes $25.7 million, $0.8 million, and $7.6 million due to the acquisitions of MDT, CTS, and TWC, respectively.