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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 27, 2021
Jun. 28, 2020
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     $ 22.4 $ 28.0    
Weighted average period for claim payments and receivables above deductible limit     17 years      
Workers' compensation reserve for excess claims $ 58.6   $ 58.6     $ 54.0
Worker's compensation receivable for excess claims 57.2   57.2     $ 52.9
Workers compensation expense $ 9.3 $ 9.2 $ 19.4 $ 23.5    
Below limit            
Workers' Compensation Deductible Limit [Line Items]            
Workers' compensation discount     1.70%   1.80%  
Above Limit            
Workers' Compensation Deductible Limit [Line Items]            
Workers' compensation discount     1.40%     1.30%