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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 |  |  |  |

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