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SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Dec. 29, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 2,921 $ 4,288 $ 5,026
Current period provision 6,493 6,300 7,661
Write-offs (2,713) (8,181) (8,358)
Foreign currency translation (14) (10) (41)
Ending balance 6,687 2,921 4,288
Prepaid software agreements 10,078 8,643  
Other prepaid expenses 8,858 8,631  
Other current assets 12,678 8,863  
Prepaid expenses and other current assets 31,614 26,137  
Gross property and equipment 254,197 225,037  
Less accumulated depreciation (166,107) (153,303)  
Property and equipment, net 88,090 71,734  
Capitalized computer software, net 29,300 27,600  
Depreciation expense 20,900 21,900 19,700
Buildings and land      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 50,444 44,479  
Software      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 139,363 127,715  
Computers, furniture and equipment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 47,816 42,846  
Construction in progress      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Gross property and equipment 16,574 9,997  
Cumulative Effect, Period of Adoption, Adjustment      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 0 524 0
Ending balance   $ 0 $ 524