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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) (USD $)
3 Months Ended
Mar. 28, 2014
Mar. 29, 2013
Dec. 27, 2013
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000,000.0    
Weighted average period - claim payments and receivables above deductible limit 15 years 7 months    
Workers compensation valuation allowance 4,900,000   5,700,000
Workers' compensation claim receivables net of valuation allowance 29,000,000   28,400,000
Workers' compensation expense 15,900,000 13,100,000  
Below limit
     
Workers' Compensation Deductible Limit [Line Items]      
Weighted average rate 2.10%    
Above limit
     
Workers' Compensation Deductible Limit [Line Items]      
Weighted average rate 3.90%    
Discounted workers compensation reserve for excess claims 33,900,000   34,100,000
Workers' compensation liability - claims receivable from insurance carriers $ 33,900,000   $ 34,100,000