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ACQUISITIONS AND DIVESTITURE (Aon Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 04, 2016
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Business Acquisition [Line Items]        
Cash purchase price, net of working capital adjustment   $ 22,742 $ 0 $ 72,476
Goodwill   $ 237,287 $ 226,694 $ 224,223
Aon Hewitt        
Business Acquisition [Line Items]        
Cash purchase price, net of working capital adjustment $ 72,476      
Accounts receivable 12,272      
Prepaid expenses, deposits and other current assets 894      
Intangible Assets 35,300      
Total assets acquired 48,466      
Accrued wages and benefits 1,025      
Other long-term liabilities 456      
Total liabilities assumed 1,481      
Net identifiable assets acquired 46,985      
Goodwill $ 25,491      
Goodwill, expected tax deductible amount, Period 15 years      
Customer relationships | Aon Hewitt        
Business Acquisition [Line Items]        
Intangible Assets $ 34,900      
Technologies | Aon Hewitt        
Business Acquisition [Line Items]        
Intangible Assets $ 400