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SEGMENT INFORMATION Narrative (Details)	12 Months Ended
	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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Net Property and Equipment Percent

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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