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RESTRICTED CASH AND INVESTMENTS (Details) (USD $) | Sep. 27, 2013 | Dec. 28, 2012
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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.

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