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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000    
Weighted average period - claim payments below deductible limit 5 years    
Payments made against self-insured claims $ 63,100 $ 64,700 $ 66,800
Weighted average period - claim payments and receivables above deductible limit 16 years    
Workers' compensation excess claims reserve $ 45,253 48,200  
Worker's compensation excess claim receivables, net of valuation allowance 44,624 44,915  
Workers' compensation costs $ 60,200 $ 69,200 $ 83,700
Below limit      
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation discount, percent 2.00% 2.00%  
Above limit [Member]      
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation discount, percent 2.40% 2.90%