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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Dec. 28, 2012
Dec. 30, 2011
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 21,500,000 $ 21,300,000
Cash and cash equivalents held in Trust 14,800,000 [1] 19,200,000 [1]
Investments held in Trust 91,200,000 78,000,000
Cash collateral backing letters of credit 1,800,000 5,900,000
Other 7,000,000 [2] 6,100,000 [2]
Total restricted cash and investments 136,259,000 130,498,000
Accrued interest on trust investments 900,000 800,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 91,200,000 78,000,000
Gross Unrealized Gain 1,600,000 1,100,000
Gross Unrealized Loss (100,000) (100,000)
Fair Value 92,700,000 79,000,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 11,800,000  
Due after one year through five years 43,300,000  
Due after five years through ten years 36,100,000  
Amortized Cost 91,200,000 78,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 11,800,000  
Due after one year through five years 44,100,000  
Due after five years through ten years 36,800,000  
Fair Value 92,700,000 79,000,000
Municipal securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 57,300,000 42,800,000
Gross Unrealized Gain 1,000,000 800,000
Gross Unrealized Loss (100,000) (100,000)
Fair Value 58,200,000 43,500,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 57,300,000 42,800,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 58,200,000 43,500,000
Corporate bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 17,900,000 16,100,000
Gross Unrealized Gain 300,000 200,000
Gross Unrealized Loss 0 0
Fair Value 18,200,000 16,300,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 17,900,000 16,100,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 18,200,000 16,300,000
Asset backed bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 16,000,000 13,600,000
Gross Unrealized Gain 300,000 100,000
Gross Unrealized Loss 0 0
Fair Value 16,300,000 13,700,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 16,000,000 13,600,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 16,300,000 13,700,000
State government and agency securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost   4,500,000
Gross Unrealized Gain   0
Gross Unrealized Loss   0
Fair Value   4,500,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost   4,500,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value   4,500,000
United States Treasury securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost   1,000,000
Gross Unrealized Gain   0
Gross Unrealized Loss   0
Fair Value   1,000,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost   1,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value   $ 1,000,000
[1] Included in this amount is $0.9 million and $0.8 million of accrued interest at December 28, 2012 and December 30, 2011, respectively.
[2] Primarily consists of restricted cash in money market accounts and deferred compensation plan accounts which are comprised of mutual funds.