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WORKERS' COMPENSATION INSURANCE AND RESERVES - Narrative (Details) (USD $)
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Workers' Compensation Deductible Limit [Line Items]      
Workers' compensation claim deductible limit $ 2,000,000.0    
Undiscounted workers’ compensation reserve 234,400,000 216,000,000  
Weighted average period - claim payments and receivables above deductible limit 15 years 6 months    
Workers compensation valuation allowance 5,700,000 5,600,000  
Workers' compensation claim receivables net of valuation allowance 28,400,000 21,400,000  
Workers' compensation expense 63,200,000 52,300,000 51,200,000
Below limit
      
Workers' Compensation Deductible Limit [Line Items]      
Weighted average discount rate - claims below deductible limit 2.10% 2.40%  
Above limit
      
Workers' Compensation Deductible Limit [Line Items]      
Undiscounted workers’ compensation reserve 34,100,000 27,100,000  
Weighted average discount rate - claims and receivables above deductible limit 3.90%    
Workers' compensation liability - claims receivable from insurance carriers $ 34,100,000 $ 27,100,000