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RESTRICTED CASH AND INVESTMENTS (Details) (USD $) | Sep. 26, 2014 | Dec. 27, 2013
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Restricted Cash and Investments [Line Items] |  |  |  |
Cash collateral held by insurance carriers | $ 22,643,000 |  | $ 23,747,000 |
Cash and cash equivalents held in Trust | 25,806,000 | [1] | 31,474,000 | [1]
Investments held in Trust | 92,699,000 |  | 86,678,000 |
Cash collateral backing letters of credit | 1,864,000 |  | 1,864,000 |
Other | 9,269,000 | [2] | 10,795,000 | [2]
Restricted cash and investments | 152,281,000 |  | 154,558,000 |
Accrued interest on trust investments | 900,000 |  | 800,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 92,699,000 |  | 86,678,000 |
Gross Unrealized Gain | 1,321,000 |  | 1,043,000 |
Gross Unrealized Loss | (269,000) |  | (781,000) |
Fair Value | 93,751,000 |  | 86,940,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 92,699,000 |  | 86,678,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 93,751,000 |  | 86,940,000 |
Municipal debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 54,267,000 |  | 54,133,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 54,267,000 |  | 54,133,000 |
Gross Unrealized Gain | 988,000 |  | 722,000 |
Gross Unrealized Loss | (86,000) |  | (398,000) |
Fair Value | 55,169,000 |  | 54,457,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 54,267,000 |  | 54,133,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 55,169,000 |  | 54,457,000 |
Corporate debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 27,785,000 |  | 19,694,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 27,785,000 |  | 19,694,000 |
Gross Unrealized Gain | 194,000 |  | 180,000 |
Gross Unrealized Loss | (145,000) |  | (294,000) |
Fair Value | 27,834,000 |  | 19,580,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 27,785,000 |  | 19,694,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 27,834,000 |  | 19,580,000 |
Asset-backed securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 10,647,000 |  | 12,851,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 10,647,000 |  | 12,851,000 |
Gross Unrealized Gain | 139,000 |  | 141,000 |
Gross Unrealized Loss | (38,000) |  | (89,000) |
Fair Value | 10,748,000 |  | 12,903,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 10,647,000 |  | 12,851,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 10,748,000 |  | 12,903,000 |
Restricted Cash and Investments |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 92,699,000 |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 92,699,000 |  |  |
Fair Value | 93,751,000 |  |  |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Due in one year or less | 10,797,000 |  |  |
Due after one year through five years | 41,358,000 |  |  |
Due after five years through ten years | 40,544,000 |  |  |
Amortized Cost | 92,699,000 |  |  |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Due in one year or less | 10,853,000 |  |  |
Due after one year through five years | 41,874,000 |  |  |
Due after five years through ten years | 41,024,000 |  |  |
Fair Value | $ 93,751,000 |  |  |
[1] | Included in this amount is $0.9 million and $0.8 million of accrued interest at September 26, 2014 and December 27, 2013, respectively.
[2] | consists of deferred compensation plan accounts, which are comprised of mutual funds.

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