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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Jun. 28, 2013
Dec. 28, 2012
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 24,600,000 $ 21,500,000
Cash and cash equivalents held in Trust 16,600,000 [1] 14,800,000 [1]
Investments held in Trust 85,900,000 91,200,000
Cash collateral backing letters of credit 1,800,000 1,800,000
Other 5,200,000 7,000,000 [2]
Total restricted cash and investments 134,052,000 136,259,000
Accrued interest on trust investments 800,000 900,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 85,900,000 91,200,000
Gross Unrealized Gain 900,000 1,600,000
Gross Unrealized Loss (800,000) (100,000)
Fair Value 86,000,000 92,700,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 9,000,000  
Due after one year through five years 43,100,000  
Due after five years through ten years 33,800,000  
Amortized Cost 85,900,000 91,200,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 9,000,000  
Due after one year through five years 43,500,000  
Due after five years through ten years 33,500,000  
Fair Value 86,000,000 92,700,000
Municipal securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 55,600,000 57,300,000
Gross Unrealized Gain 600,000 1,000,000
Gross Unrealized Loss (400,000) (100,000)
Fair Value 55,800,000 58,200,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 55,600,000 57,300,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 55,800,000 58,200,000
Corporate bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 15,600,000 17,900,000
Gross Unrealized Gain 200,000 300,000
Gross Unrealized Loss (300,000) 0
Fair Value 15,500,000 18,200,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 15,600,000 17,900,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 15,500,000 18,200,000
Asset backed bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 14,700,000 16,000,000
Gross Unrealized Gain 100,000 300,000
Gross Unrealized Loss (100,000) 0
Fair Value 14,700,000 16,300,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 14,700,000 16,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value $ 14,700,000 $ 16,300,000
[1] Included in this amount is $0.8 million and $0.9 million of accrued interest at June 28, 2013 and December 28, 2012, respectively.
[2] Primarily consists of restricted cash in money market accounts and deferred compensation plan accounts which are comprised of mutual funds.