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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000    
Weighted average period - claim payments below deductible limit 4 years 6 months    
Payments made against self-insured claims $ 64,700 $ 66,800 $ 73,600
Weighted average period - claim payments and receivables above deductible limit 16 years    
Excess claims $ 48,229 48,800  
Workers' compensation claim receivables net of valuation allowance 44,915 45,048  
Workers' compensation expense $ 69,200 $ 83,700 $ 94,000
Below limit      
Workers' Compensation Deductible Limit [Line Items]      
Weighted average rate 2.00% 1.80%