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RESTRICTED CASH AND INVESTMENTS (Details) (USD $) | Dec. 27, 2013 | Dec. 28, 2012
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Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers | $ 23,700,000 | $ 21,500,000 |
Cash and cash equivalents held in Trust | 31,500,000 | 14,800,000 | [1]
Cash collateral backing letters of credit | 1,900,000 | 1,800,000 |
Other | 10,800,000 | 7,000,000 | [2]
Total restricted cash and investments | 154,558,000 | 136,259,000 |
Accrued interest on trust investments | 800,000 | 900,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost | 86,700,000 | 91,200,000 |
Gross Unrealized Gain | 1,000,000 | 1,600,000 |
Gross Unrealized Loss | (800,000) | (100,000) |
Fair Value | 86,900,000 | 92,700,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less | 10,200,000 |  |
Due after one year through five years | 42,100,000 |  |
Due after five years through ten years | 34,400,000 |  |
Amortized Cost | 86,700,000 | 91,200,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Due in one year or less | 10,200,000 |  |
Due after one year through five years | 42,800,000 |  |
Due after five years through ten years | 33,900,000 |  |
Fair Value | 86,900,000 | 92,700,000 |
Municipal debt securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost | 54,100,000 | 57,300,000 |
Gross Unrealized Gain | 700,000 | 1,000,000 |
Gross Unrealized Loss | (400,000) | (100,000) |
Fair Value | 54,400,000 | 58,200,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost | 54,100,000 | 57,300,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value | 54,400,000 | 58,200,000 |
Corporate debt securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost | 19,700,000 | 17,900,000 |
Gross Unrealized Gain | 200,000 | 300,000 |
Gross Unrealized Loss | (300,000) | 0 |
Fair Value | 19,600,000 | 18,200,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost | 19,700,000 | 17,900,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value | 19,600,000 | 18,200,000 |
Asset-backed securities |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost | 12,900,000 | 16,000,000 |
Gross Unrealized Gain | 100,000 | 300,000 |
Gross Unrealized Loss | (100,000) | 0 |
Fair Value | 12,900,000 | 16,300,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost | 12,900,000 | 16,000,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value | $ 12,900,000 | $ 16,300,000 |
[1] | Included in this amount is $0.8 million and $0.9 million of accrued interest at December 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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