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WORKERS' COMPENSATION INSURANCE AND RESERVES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000    
Weighted average period - claim payments below deductible limit 5 years 6 months    
Undiscounted workers’ compensation reserve $ 273,502 $ 274,934  
Less discount on workers’ compensation reserve 18,009 19,316  
Workers’ compensation reserve, net of discount 255,493 255,618  
Less current portion 66,007 73,020  
Long-term portion 189,486 182,598  
Payments made against self-insured claims $ 52,800 63,100 $ 64,700
Weighted average period - claim payments and receivables above deductible limit 17 years    
Workers' compensation excess claims reserve $ 54,019 45,300  
Worker's compensation excess claim receivables, net of valuation allowance 52,934 44,624  
Expected Future Workers' Compensation Payments [Abstract]      
2020 66,007    
2021 35,200    
2022 20,077    
2023 13,204    
2024 9,508    
Thereafter 57,478    
Sub-total 201,474    
Excess claims 54,019 45,300  
Total 255,493    
Workers' compensation costs 49,400 60,200 69,200
Allowance for Receivable from Insurance Provider      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 629 3,314 3,778
Charged to expense 13 120 120
Release of allowance (629) (2,805) (584)
Ending balance 85 629 3,314
Allowance for Receivable from Insurance Provider | Cumulative Effect, Period of Adoption, Adjustment      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance $ 72 0 0
Ending balance   $ 72 $ 0
Below limit      
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation discount, percent 1.80% 2.00%  
Above limit [Member]      
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation discount, percent 1.30% 2.40%