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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 4,288 $ 5,026 $ 4,344
Current period provision 6,300 7,661 10,042
Write-offs (8,181) (8,358) (9,349)
Foreign currency translation (10) (41) (11)
Ending balance 2,921 4,288 5,026
Prepaid software agreements 8,643 9,576  
Other prepaid expenses 8,631 7,761  
Other current assets 8,863 13,380  
Prepaid expenses and other current assets 26,137 30,717  
Gross property and equipment 225,037 242,496  
Less accumulated depreciation (153,303) (176,346)  
Property and equipment, net 71,734 66,150  
Capitalized computer software, net 27,600 26,000  
Depreciation expense 21,900 19,700 20,300
Deferred employer payroll tax 55,420 0  
Other accrued wages and benefits 67,237 67,604  
Accrued wages and benefits 122,657 67,604  
Buildings and land      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 44,479 43,621  
Software      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 127,715 132,378  
Computers, furniture and equipment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 42,846 57,770  
Construction in progress      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 9,997 8,727  
Cumulative Effect, Period of Adoption, Adjustment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 524 0 0
Ending balance   $ 524 $ 0