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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Dec. 29, 2019
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation claim deductible limit     $ 2.0    
Weighted average period for claim payments below deductible limit     5 years    
Payments made against self-insured claims     $ 28.0 $ 32.6  
Weighted average period for claim payments and receivables above deductible limit     17 years    
Workers' compensation reserve for excess claims $ 47.6   $ 47.6   $ 45.3
Worker's compensation receivable for excess claims 46.6   46.6   $ 45.3
Workers compensation expense $ 9.2 $ 16.3 $ 23.5 $ 28.2  
Below limit          
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation discount     1.90%    
Above Limit          
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation discount     1.70%   2.40%