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WORKERS' COMPENSATION INSURANCE AND RESERVES (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Workers' Compensation Insurance and Reserves [Abstract]      
Workers' compensation claim deductible limit $ 2.0    
Weighted average discount rate - claims below deductible limit 2.40%    
Weighted average period - claim payments below deductible limit 5 years 6 months    
Workers' compensation liability 195.6 191.8  
Weighted average discount rate - claims and receivables above deductible limit 4.40%    
Weighted average period - claim payments and receivables above deductible limit 19 years 8 months 12 days    
Workers' compensation liability - claim payments reserve 27.1 27.4  
workers' compensation liabilty - claims receivable from insurance carriers 27.1 27.4  
Workers compensation valuation allowance 5.6 7.3  
Workers' compensation claim receivables net of valuation allowance 21.4 20.1  
Workers' compensation expense $ 52.3 $ 51.2 $ 43.3