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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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