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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Jun. 29, 2012
Dec. 30, 2011
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 21,200,000 $ 21,300,000
Cash and cash equivalents held in Trust 15,800,000 [1] 19,200,000 [1]
Investments held in Trust 82,200,000 78,000,000
Cash collateral backing letters of credit 1,800,000 5,900,000
Other 3,900,000 [2] 6,100,000 [2]
Total restricted cash and investments 124,949,000 130,498,000
Accrued interest on trust investments 800,000 800,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 82,200,000 78,000,000
Gross Unrealized Gain 1,400,000 1,100,000
Gross Unrealized Loss 0 (100,000)
Fair Value 83,600,000 79,000,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Due in one year or less, Amortized Cost 10,700,000  
Due after one year through five years, Amortized Cost 42,100,000  
Due after five years through ten years, Amortized Cost 29,400,000  
Amortized Cost 82,200,000 78,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less, Fair Value 10,700,000  
Due after one year through five years, Fair Value 42,900,000  
Due after five years through ten years, Fair Value 30,000,000  
Fair Value 83,600,000 79,000,000
Municipal securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 50,900,000 42,800,000
Gross Unrealized Gain 900,000 800,000
Gross Unrealized Loss 0 (100,000)
Fair Value 51,800,000 43,500,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Amortized Cost 50,900,000 42,800,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 51,800,000 43,500,000
Corporate bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 14,300,000 16,100,000
Gross Unrealized Gain 300,000 200,000
Gross Unrealized Loss 0 0
Fair Value 14,600,000 16,300,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Amortized Cost 14,300,000 16,100,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 14,600,000 16,300,000
Asset backed bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 17,000,000 13,600,000
Gross Unrealized Gain 200,000 100,000
Gross Unrealized Loss 0 0
Fair Value 17,200,000 13,700,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Amortized Cost 17,000,000 13,600,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 17,200,000 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, Net Carrying Amount [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, Net Carrying Amount [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 $0.8 million of accrued interest at both June 29, 2012 and December 30, 2011.
[2] Primarily consists of restricted cash in money market accounts and deferred compensation plan accounts which are comprised of mutual funds.