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SEGMENT INFORMATION Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 | Jan. 01, 2017 | Dec. 25, 2015
International operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net property and equipment, percent | 9.10% | 7.10% |
Customer A | Customer Concentration Risk | Sales Revenue, Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage |  |  | 13.10%
Customer A | Customer Concentration Risk | Sales Revenue, Segment | PeopleManagement |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage |  | 18.20% | 36.70%
Customer B | Customer Concentration Risk | Sales Revenue, Segment | PeopleScout |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 14.40% | 12.80% |
Customer C | Customer Concentration Risk | Sales Revenue, Segment | PeopleScout |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 10.10% | 10.00% |
Customer D | Customer Concentration Risk | Sales Revenue, Segment | PeopleScout |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage |  |  | 10.60%
Customer E | Customer Concentration Risk | Sales Revenue, Segment | PeopleScout |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage |  |  | 10.20%

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