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RESTRICTED CASH AND INVESTMENTS (Details) (USD $)
Jun. 27, 2014
Dec. 27, 2013
Restricted Cash and Investments [Line Items]    
Cash collateral held by insurance carriers $ 22,707,000 $ 23,747,000
Cash and cash equivalents held in Trust 16,874,000 [1] 31,474,000 [1]
Investments held in Trust 96,574,000 86,678,000
Cash collateral backing letters of credit 1,864,000 1,864,000
Other 7,889,000 [2] 10,795,000 [2]
Restricted cash and investments 145,908,000 154,558,000
Accrued interest on trust investments 800,000 800,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 96,574,000 86,678,000
Gross Unrealized Gain 1,436,000 1,043,000
Gross Unrealized Loss (232,000) (781,000)
Fair Value 97,778,000 86,940,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 96,574,000 86,678,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 97,778,000 86,940,000
Municipal debt securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 57,346,000 54,133,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 57,346,000 54,133,000
Gross Unrealized Gain 984,000 722,000
Gross Unrealized Loss (116,000) (398,000)
Fair Value 58,214,000 54,457,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 57,346,000 54,133,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 58,214,000 54,457,000
Corporate debt securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 27,855,000 19,694,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 27,855,000 19,694,000
Gross Unrealized Gain 270,000 180,000
Gross Unrealized Loss (100,000) (294,000)
Fair Value 28,025,000 19,580,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 27,855,000 19,694,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 28,025,000 19,580,000
Asset-backed securities
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 11,373,000 12,851,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 11,373,000 12,851,000
Gross Unrealized Gain 182,000 141,000
Gross Unrealized Loss (16,000) (89,000)
Fair Value 11,539,000 12,903,000
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Amortized Cost 11,373,000 12,851,000
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Fair Value 11,539,000 12,903,000
Restricted Cash and Investments
    
Restricted Cash and Investments [Line Items]    
Investments held in Trust 96,574,000  
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]    
Amortized Cost 96,574,000  
Fair Value 97,778,000  
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]    
Due in one year or less 11,188,000  
Due after one year through five years 43,548,000  
Due after five years through ten years 41,838,000  
Amortized Cost 96,574,000  
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]    
Due in one year or less 11,241,000  
Due after one year through five years 44,165,000  
Due after five years through ten years 42,372,000  
Fair Value $ 97,778,000  
[1] Included in this amount is $0.8 million of accrued interest at June 27, 2014 and December 27, 2013, respectively.
[2] consists of deferred compensation plan accounts, which are comprised of mutual funds.