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SEGMENT INFORMATION Revenue by Major Source (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Disaggregation of Revenue [Line Items]    
Revenue $ 552,352 $ 554,388
Contingent staffing    
Disaggregation of Revenue [Line Items]    
Revenue 484,912 500,727
Human resource outsourcing    
Disaggregation of Revenue [Line Items]    
Revenue 67,440 53,661
PeopleReady    
Disaggregation of Revenue [Line Items]    
Revenue 326,868 316,835
PeopleReady | Contingent staffing    
Disaggregation of Revenue [Line Items]    
Revenue 326,868 316,835
PeopleReady | Human resource outsourcing    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
PeopleManagement    
Disaggregation of Revenue [Line Items]    
Revenue 158,044 183,892
PeopleManagement | Contingent staffing    
Disaggregation of Revenue [Line Items]    
Revenue 158,044 183,892
PeopleManagement | Human resource outsourcing    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
PeopleScout    
Disaggregation of Revenue [Line Items]    
Revenue 67,440 53,661
PeopleScout | Contingent staffing    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
PeopleScout | Human resource outsourcing    
Disaggregation of Revenue [Line Items]    
Revenue $ 67,440 $ 53,661