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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Mar. 28, 2014
Dec. 27, 2013
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 23,000,000 $ 23,700,000
Cash and cash equivalents held in Trust 37,100,000 [1] 31,500,000 [1]
Investments held in Trust 81,900,000 86,700,000
Cash collateral backing letters of credit 1,900,000 1,900,000
Other 7,500,000 [2] 10,800,000 [2]
Restricted cash and investments 151,381,000 154,558,000
Accrued interest on trust investments 800,000 800,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 81,900,000 86,700,000
Gross Unrealized Gain 1,200,000 1,000,000
Gross Unrealized Loss (500,000) (800,000)
Fair Value 82,600,000 86,900,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 81,900,000 86,700,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 82,600,000 86,900,000
Municipal debt securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 50,200,000 54,100,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 50,200,000 54,100,000
Gross Unrealized Gain 800,000 700,000
Gross Unrealized Loss (300,000) (400,000)
Fair Value 50,700,000 54,400,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 50,200,000 54,100,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 50,700,000 54,400,000
Corporate debt securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 19,600,000 19,700,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 19,600,000 19,700,000
Gross Unrealized Gain 200,000 200,000
Gross Unrealized Loss (200,000) (300,000)
Fair Value 19,600,000 19,600,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 19,600,000 19,700,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 19,600,000 19,600,000
Asset-backed securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 12,100,000 12,900,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 12,100,000 12,900,000
Gross Unrealized Gain 200,000 100,000
Gross Unrealized Loss 0 (100,000)
Fair Value 12,300,000 12,900,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 12,100,000 12,900,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 12,300,000 12,900,000
Restricted Cash and Investments
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 81,900,000  
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 81,900,000  
Fair Value 82,600,000  
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 10,900,000  
Due after one year through five years 41,200,000  
Due after five years through ten years 29,800,000  
Amortized Cost 81,900,000  
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 10,900,000  
Due after one year through five years 41,900,000  
Due after five years through ten years 29,800,000  
Fair Value $ 82,600,000  
[1] Included in this amount is $0.8 million of accrued interest at March 28, 2014 and December 27, 2013.
[2] Consists of restricted cash in money market accounts and deferred compensation plan accounts, which are comprised of mutual funds.