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GOODWILL AND INTANGIBLE ASSETS - Components of Intangible Assets Acquired (Details) (USD $)
12 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Dec. 27, 2013
Dec. 27, 2013
Customer relationships
Dec. 27, 2013
Trade name/trademarks
Dec. 27, 2013
Non-compete agreements
Dec. 27, 2013
MDT Personnel, LLC
Feb. 04, 2013
MDT Personnel, LLC
Feb. 04, 2013
MDT Personnel, LLC
Customer relationships
Dec. 27, 2013
MDT Personnel, LLC
Customer relationships
Feb. 04, 2013
MDT Personnel, LLC
Trade name/trademarks
Dec. 27, 2013
MDT Personnel, LLC
Trade name/trademarks
Feb. 04, 2013
MDT Personnel, LLC
Non-compete agreements
Dec. 27, 2013
MDT Personnel, LLC
Non-compete agreements
Dec. 27, 2013
Crowley Transportation Services, LLC
Dec. 27, 2013
Crowley Transportation Services, LLC
Customer relationships
Dec. 27, 2013
Crowley Transportation Services, LLC
Trade name/trademarks
Dec. 27, 2013
Crowley Transportation Services, LLC
Non-compete agreements
Dec. 27, 2013
The Work Connection, Inc.
Oct. 02, 2013
The Work Connection, Inc.
Dec. 27, 2013
The Work Connection, Inc.
Customer relationships
Dec. 27, 2013
The Work Connection, Inc.
Trade name/trademarks
Dec. 27, 2013
The Work Connection, Inc.
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]                                          
Estimated Fair Value $ 19,900,000 $ 16,800,000 $ 1,700,000 $ 1,400,000 $ 10,200,000 $ 10,200,000 $ 7,800,000 $ 7,800,000   $ 1,000,000 $ 1,400,000 $ 1,400,000 $ 1,500,000 $ 1,400,000 $ 100,000 $ 0 $ 8,200,000 $ 8,200,000 $ 7,600,000 $ 600,000 $ 0
Weighted Average Life   8 years 1 year 5 years     8 years   1 year 6 months   5 years