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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 25, 2015
Dec. 26, 2014
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000    
Weighted average period - claim payments below deductible limit 4 years 5 months 24 days    
Payments made against self-insured claims $ 73,600 $ 70,700 $ 60,600
Weighted average period - claim payments and receivables above deductible limit 15 years    
Excess claims $ 52,930 49,000  
Workers' compensation claim receivables net of valuation allowance 48,900 45,200  
Workers' compensation expense $ 94,000 $ 98,200 $ 77,500
Below limit      
Workers' Compensation Deductible Limit [Line Items]      
Weighted average rate 1.60% 1.80%