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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 25, 2015
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 $ 66,800 $ 73,600 $ 70,700
Weighted average period - claim payments and receivables above deductible limit 15 years    
Excess claims $ 48,826 52,900  
Workers' compensation claim receivables net of valuation allowance 45,000 48,900  
Workers' compensation expense $ 83,700 $ 94,000 $ 98,200
Below limit      
Workers' Compensation Deductible Limit [Line Items]      
Weighted average rate 1.80% 1.60%