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GOODWILL AND INTANGIBLE ASSETS - Narrative Impairment (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Jan. 01, 2017	Sep. 23, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 31, 2017	Jan. 01, 2017	Dec. 25, 2015
Goodwill [Line Items]
Goodwill and intangible asset impairment	$ 0	$ (4,275)	$ (99,269)	$ 0	$ 0	$ (103,544)	$ 0
Impairment loss					$ 0	$ 65,869	$ 0
Minimum
Goodwill [Line Items]
Weighted average cost of capital	12.00%					12.00%
Maximum
Goodwill [Line Items]
Weighted average cost of capital	17.00%					17.00%
Customer relationships
Goodwill [Line Items]
Impairment of intangible assets, finite-lived						$ 28,900
Fair value inputs, discount rate						13.00%
Trade name/trademarks
Goodwill [Line Items]
Impairment of intangible assets, indefinite-lived						$ 4,500
Fair value inputs, discount rate						17.00%
Fair value inputs, royalty rate						10.00%
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]
Sales revenue						125,000
PeopleScout
Goodwill [Line Items]
Impairment loss						15,169
PeopleScout | hrX
Goodwill [Line Items]
Impairment loss						15,169
PeopleManagement
Goodwill [Line Items]
Impairment loss						50,700
PeopleManagement | Staff Management SMX
Goodwill [Line Items]
Impairment loss						33,700
PeopleManagement | PlaneTechs
Goodwill [Line Items]
Impairment loss						$ 17,000

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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