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ACQUISITION AND DIVESTITURE (Details) - USD ($)
$ in Thousands
 2 Months Ended 7 Months Ended 12 Months Ended
Jun. 12, 2018
Mar. 12, 2018
Mar. 12, 2018
Dec. 30, 2018
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Business Acquisition [Line Items]              
Acquisition/integration costs         $ 0 $ 1,562 $ 2,672
Goodwill       $ 237,287 94,873 237,498 237,287
Cash purchase price, net of working capital adjustment         0 0 22,742
Revenue from services         1,846,360 2,368,779 2,499,207
Divestiture of business         0 215 10,587
Divestiture non-cash consideration         0 0 798
PlaneTechs              
Business Acquisition [Line Items]              
Revenue from services     $ 8,000        
Divestiture of business   $ 11,400          
Divestiture, amount of consideration received   8,500          
Divestiture non-cash consideration   $ 1,600          
Debt instrument, periodic payment           100  
Gain on Disposition of Assets           700  
TMP              
Business Acquisition [Line Items]              
Cash purchase price, net of cash acquired $ 22,742            
Cash acquired from acquisition 7,000            
Acquisition/integration costs           1,600 $ 2,700
Accounts receivable 9,770            
Prepaid expenses, deposits and other current assets 337            
Property and equipment 435            
Intangible assets 8,024            
Total assets acquired 18,566            
Accounts payable and other accrued expenses 9,139            
Accrued wages and benefits 1,642            
Income tax payable 205            
Deferred income tax liability 1,444            
Total liabilities assumed 12,430            
Net identifiable assets acquired 6,136            
Goodwill 16,606            
Cash purchase price, net of working capital adjustment 22,742            
Estimated fair value 8,024            
Revenue from services       $ 31,000 $ 46,000 $ 51,300  
TMP | Customer relationships              
Business Acquisition [Line Items]              
Intangible assets 6,286            
Estimated fair value 6,286            
TMP | Customer relationships | Other service              
Business Acquisition [Line Items]              
Intangible assets 2,809            
Estimated fair value $ 2,809            
Estimated useful life in years 3 years            
TMP | Customer relationships | RPO              
Business Acquisition [Line Items]              
Intangible assets $ 3,477            
Estimated fair value $ 3,477            
Estimated useful life in years 7 years            
TMP | Trade name/trademarks              
Business Acquisition [Line Items]              
Intangible assets $ 1,738            
Estimated fair value $ 1,738            
Estimated useful life in years 14 years