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GOODWILL AND INTANGIBLE ASSETS - Narrative Impairment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Goodwill [Line Items]
Goodwill, Impairment Loss											$ 65,869
Revenue from services	$ 650,147	$ 680,371	$ 614,301	$ 554,388	$ 669,625	$ 660,780	$ 610,122	$ 568,244	$ 2,499,207	$ 2,508,771	$ 2,750,640
Minimum
Goodwill [Line Items]
Weighted average cost of capital											12.00%
Maximum
Goodwill [Line Items]
Weighted average cost of capital											17.00%
Trade name/trademarks
Goodwill [Line Items]
Impairment of intangible assets, indefinite-lived											$ 4,500
Servicing Asset, Measurement Input											0.170
Fair value inputs, royalty rate											10.00%
Customer relationships
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived											$ 28,900
Servicing Asset, Measurement Input											0.130
CLP and Spartan | Trade name/trademarks
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived											$ 4,300
Customer Concentration Risk | Amazon | Sales Revenue, Net
Goodwill [Line Items]
Revenue from services											125,000
PeopleManagement
Goodwill [Line Items]
Revenue from services									728,254	807,273	940,453
PeopleManagement | Staff Management SMX
Goodwill [Line Items]
Goodwill, Impairment Loss											33,700
PeopleManagement | PlaneTechs
Goodwill [Line Items]
Goodwill, Impairment Loss											17,000
PeopleScout
Goodwill [Line Items]
Revenue from services									$ 248,877	$ 190,138	180,732
PeopleScout | hrX
Goodwill [Line Items]
Goodwill, Impairment Loss											$ 15,200

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