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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Jun. 28, 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 $ 11.2 $ 14.6    
Weighted average period for claim payments and receivables above deductible limit 17 years      
Workers' compensation reserve for excess claims $ 54.6     $ 54.0
Worker's compensation receivable for excess claims 53.6     $ 52.9
Workers compensation expense $ 10.1 $ 14.3    
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 1.20%   1.30%