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WORKERS' COMPENSATION INSURANCE AND RESERVES (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Sep. 27, 2013
Sep. 28, 2012
Dec. 28, 2012
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation claim deductible limit     $ 2,000,000.0    
Weighted average period - claim payments below deductible limit     5 years 6 months    
Workers' compensation liability 207,800,000   207,800,000   195,600,000
Weighted average period - claim payments and receivables above deductible limit     19 years 9 months 18 days    
Workers compensation valuation allowance 5,700,000   5,700,000   5,600,000
Workers' compensation claim receivables net of valuation allowance 23,300,000   23,300,000   21,400,000
Workers' compensation expense 16,700,000 14,800,000 46,400,000 40,100,000  
Below limit
          
Workers' Compensation Deductible Limit [Line Items]          
Weighted average discount rate - claims below deductible limit     2.10%    
Above limit
          
Workers' Compensation Deductible Limit [Line Items]          
Workers' compensation liability 29,000,000   29,000,000   27,100,000
Weighted average discount rate - claims and receivables above deductible limit     4.60%    
Workers' compensation liability - claims receivable from insurance carriers $ 29,000,000   $ 29,000,000   $ 27,100,000