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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 26, 2021
Sep. 27, 2020
Dec. 27, 2020
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation claim deductible limit     $ 2.0    
Weighted average period for claim payments below deductible limit     5 years 6 months    
Payments made against self-insured claims     $ 32.0 $ 40.6  
Weighted average period for claim payments and receivables above deductible limit     17 years    
Workers' compensation reserve for excess claims $ 60.6   $ 60.6   $ 54.0
Worker's compensation receivable for excess claims 59.2   59.2   $ 52.9
Workers compensation expense $ 13.3 $ 14.4 $ 32.7 $ 38.0  
Below limit          
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation discount     1.60%   1.80%
Above Limit          
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation discount     1.60%   1.30%