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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Sep. 27, 2013
Dec. 28, 2012
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 24,400,000 $ 21,500,000
Cash and cash equivalents held in Trust 21,200,000 [1] 14,800,000 [1]
Cash collateral backing letters of credit 1,800,000 1,800,000
Other 5,800,000 [2] 7,000,000 [2]
Total restricted cash and investments 138,457,000 136,259,000
Accrued interest on trust investments 800,000 900,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 85,300,000 91,200,000
Gross Unrealized Gain 1,100,000 1,600,000
Gross Unrealized Loss 700,000 100,000
Fair Value 85,700,000 92,700,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 10,300,000  
Due after one year through five years 41,300,000  
Due after five years through ten years 33,700,000  
Amortized Cost 85,300,000 91,200,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 10,300,000  
Due after one year through five years 42,000,000  
Due after five years through ten years 33,400,000  
Fair Value 85,700,000 92,700,000
Municipal debt securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 56,100,000 57,300,000
Gross Unrealized Gain 700,000 1,000,000
Gross Unrealized Loss 400,000 100,000
Fair Value 56,400,000 58,200,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 56,100,000 57,300,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 56,400,000 58,200,000
Corporate debt securities
    
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 200,000 0
Fair Value 15,600,000 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 15,600,000 18,200,000
Asset-backed securities
    
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 13,600,000 16,000,000
Gross Unrealized Gain 200,000 300,000
Gross Unrealized Loss 100,000 0
Fair Value 13,700,000 16,300,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 13,600,000 16,000,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value $ 13,700,000 $ 16,300,000
[1] Included in this amount is $0.8 million and $0.9 million of accrued interest at September 27, 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.