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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]        
Advertising expense $ 5,500 $ 6,800 $ 8,100  
Accounts receivable, allowance for credit loss $ 2,921 4,288 5,026 $ 4,344
Terms of lease agreements 15 years      
Reporting unit, percentage of fair value in excess of carrying amount 20.00%      
Goodwill, impairment charge $ 140,489      
Impairment of finite-lived intangible assets 34,700      
Government incentives $ 9,900      
Cumulative Effect, Period of Adoption, Adjustment        
Property, Plant and Equipment [Line Items]        
Accounts receivable, allowance for credit loss   $ 524 $ 0 $ 0
Buildings        
Property, Plant and Equipment [Line Items]        
Useful life 40 years      
Minimum        
Property, Plant and Equipment [Line Items]        
Terms of lease agreements 3 years      
Minimum | Software        
Property, Plant and Equipment [Line Items]        
Useful life 3 years      
Minimum | Computers, furniture and equipment        
Property, Plant and Equipment [Line Items]        
Useful life 3 years      
Maximum        
Property, Plant and Equipment [Line Items]        
Terms of lease agreements 5 years      
Maximum | Software        
Property, Plant and Equipment [Line Items]        
Useful life 8 years      
Maximum | Computers, furniture and equipment        
Property, Plant and Equipment [Line Items]        
Useful life 10 years