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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Dec. 28, 2012
Feb. 04, 2013
MDT Personnel, LLC
Sep. 27, 2013
MDT Personnel, LLC
Feb. 04, 2013
MDT Personnel, LLC
Customer relationships
Feb. 04, 2013
MDT Personnel, LLC
Trade name/trademarks
Feb. 04, 2013
MDT Personnel, LLC
Non-compete agreement
Sep. 27, 2013
Crowley Transportation Services, LLC
Jun. 30, 2013
Crowley Transportation Services, LLC
Customer relationships
Jun. 30, 2013
Crowley Transportation Services, LLC
Trade name/trademarks
Sep. 27, 2013
Trade name/trademarks
Dec. 28, 2012
Trade name/trademarks
Intangible Assets [Line Items]                              
Acquired finite-lived intangible assets           $ 10,200,000   $ 7,800,000 $ 1,000,000 $ 1,400,000   $ 1,400,000 $ 100,000    
Weighted average useful life of acquired finite-lived intangible assets             6 years 11 months 13 days 8 years 1 year 6 months 5 years          
Acquired goodwill, after adjustments 74,629,000   74,629,000   48,079,000 25,700,000 [1]                  
Goodwill acquired year to date     26,500,000 [2]       25,700,000       800,000        
Amortization of intangible assets 1,200,000 800,000 3,400,000 2,400,000                      
Indefinite-lived trade name/trademarks                           $ 5,700,000 $ 5,700,000
[1] The goodwill acquired is deductible for income tax purposes.
[2] Goodwill acquired includes $25.7 million due to the MDT acquisition. Goodwill acquired also includes $0.8 million of goodwill related to our acquisition of Crowley.