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ACQUISITIONS (Seaton Pro Forma Financials) (Details) - Staffing Solutions Holdings, Inc. (Seaton) [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Business Acquisition [Line Items]    
Revenue from services $ 2,472,289 $ 2,274,742
Net income $ 64,713 $ 47,464
Net income per common share - diluted $ 1.57 $ 1.17