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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Workers' Compensation Commitments [Line Items]    
Cash collateral held by workers’ compensation insurance carriers $ 22,253 $ 22,256
Cash and cash equivalents held in Trust 29,410 23,681
Investments held in Trust 152,247 149,373
Letters of credit 6,095 6,202
Surety bonds 20,616 20,731
Total collateral commitments $ 230,621 222,243
Surety bonds annual fee limit, % of bond amount 2.00%  
Remaining lease terms 16 years  
Renewal term 10 years  
Operating lease costs $ 16,607 17,333
Short-term lease costs 7,781 7,110
Other lease costs 3,922 4,722
Total lease costs $ 28,310 $ 29,165
Weighted average remaining lease term in years 9 years 4 years 1 month 6 days
Weighted average discount rate 5.00% 5.00%
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2021 $ 7,164  
2022 12,415  
2023 10,149  
2024 7,420  
2025 5,165  
Thereafter 36,252  
Total undiscounted future non-cancelable minimum lease payments 78,565  
Less: Imputed interest 9,830  
Present value of lease liabilities 68,735  
Pending lease 2,400  
Purchase obligation 39,400  
Purchase obligation, due in next twelve months $ 22,500  
Minimum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 1 year  
Maximum    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 4 years