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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 27, 2014
Jun. 28, 2013
Jun. 27, 2014
Jun. 28, 2013
Dec. 27, 2013
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation claim deductible limit     $ 2,000,000    
Weighted average period - claim payments and receivables above deductible limit     15 years 7 months 6 days    
Workers compensation valuation allowance 4,900,000   4,900,000   5,700,000
Workers' compensation claim receivables net of valuation allowance 29,300,000   29,300,000   28,400,000
Workers' compensation expense 17,500,000 16,600,000 33,500,000 29,700,000  
Below limit
          
Workers' Compensation Deductible Limit [Line Items]          
Weighted average rate     2.00%    
Above limit
          
Workers' Compensation Deductible Limit [Line Items]          
Weighted average rate     3.90%    
Discounted workers compensation reserve for excess claims 34,200,000   34,200,000   34,100,000
Workers' compensation liability - claims receivable from insurance carriers $ 34,200,000   $ 34,200,000   $ 34,100,000