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REVENUE RECOGNITION (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | $ 554,388 | $ 568,244
Contingent staffing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 500,727 |
Human resource outsourcing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 53,661 |
PeopleReady |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 316,835 | 332,624
PeopleReady | Contingent staffing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 316,835 |
PeopleReady | Human resource outsourcing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 0 |
PeopleManagement |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 183,892 | 191,686
PeopleManagement | Contingent staffing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 183,892 |
PeopleManagement | Human resource outsourcing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 0 |
PeopleScout |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 53,661 | $ 43,934
PeopleScout | Contingent staffing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | 0 |
PeopleScout | Human resource outsourcing |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |
Revenue from services | $ 53,661 |

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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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