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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 25, 2015
Dec. 26, 2014
Dec. 27, 2013
Operating Loss Carryforwards [Line Items]          
Effective income tax rate reconciliation, percent   25.00% 26.10% 19.80%  
Income tax expense (benefit) based on statutory rate   35.00% 35.00% 35.00%  
Discrete tax benefits   $ 6,000      
Deferred tax assets, goodwill and intangible assets   17,700      
Expected Benefit   2,856      
Foreign income tax expense (benefit)   3,100 $ 7,100 $ 3,100  
Foreign income tax expense (benefit), impairment loss   12,100      
Undistributed earnings of foreign subsidiaries   18,600      
Unrecognized tax benefits   2,242 $ 2,195 $ 2,039 $ 2,035
Unrecognized tax benefits that would impact effective tax rate   1,500      
Unrecognized tax benefits, income tax penalties accrued   200      
Unrecognized tax benefits, interest on income taxes accrued   900      
Work Opportunity Tax Credit | Staffing Solutions Holdings, Inc. (Seaton) | Federal WOTCs          
Operating Loss Carryforwards [Line Items]          
Expected Benefit   $ 1,419      
Scenario, Forecast [Member] | Work Opportunity Tax Credit | Staffing Solutions Holdings, Inc. (Seaton) | Federal WOTCs          
Operating Loss Carryforwards [Line Items]          
Expected Benefit $ 1,400