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SEGMENT INFORMATION - Narrative (Details)	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
International operations
Segment Reporting Information [Line Items]
Net property and equipment, percent	6.80%	7.30%
Customer A | PeopleManagement
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%
Customer B | PeopleScout
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.50%	13.30%	14.40%
Customer C | PeopleScout
Segment Reporting Information [Line Items]
Concentration risk, percentage			10.10%

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- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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