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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Sep. 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 21,700,000 [1] 19,200,000 [1]
Investments held in Trust 80,000,000 78,000,000
Cash collateral backing letters of credit 1,800,000 5,900,000
Other 7,100,000 [2] 6,100,000 [2]
Total restricted cash and investments 132,052,000 130,498,000
Accrued interest on trust investments 800,000 800,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 80,000,000 78,000,000
Gross Unrealized Gain 1,900,000 1,100,000
Gross Unrealized Loss 0 (100,000)
Fair Value 81,900,000 79,000,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Due in one year or less, Amortized Cost 11,300,000  
Due after one year through five years, Amortized Cost 40,100,000  
Due after five years through ten years, Amortized Cost 28,600,000  
Amortized Cost 80,000,000 78,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less, Fair Value 11,400,000  
Due after one year through five years, Fair Value 41,100,000  
Due after five years through ten years, Fair Value 29,400,000  
Fair Value 81,900,000 79,000,000
Municipal securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 49,700,000 42,800,000
Gross Unrealized Gain 1,200,000 800,000
Gross Unrealized Loss 0 (100,000)
Fair Value 50,900,000 43,500,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Amortized Cost 49,700,000 42,800,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 50,900,000 43,500,000
Corporate bonds
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 14,200,000 16,100,000
Gross Unrealized Gain 400,000 200,000
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 14,200,000 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 16,100,000 13,600,000
Gross Unrealized Gain 300,000 100,000
Gross Unrealized Loss 0 0
Fair Value 16,400,000 13,700,000
Held-to-maturity Securities, Investment Maturities, Net Carrying Amount [Abstract]    
Amortized Cost 16,100,000 13,600,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 16,400,000 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 September 28, 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.