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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 26, 2015 | Dec. 26, 2014
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers |  | $ 22,305 | $ 22,639
Cash and cash equivalents held in Trust |  | 34,057 | 43,856
Investments held in Trust |  | 94,598 | 90,095
Cash collateral backing letters of credit |  | 1,864 | 1,864
Other | [1] | 11,849 | 9,972
Restricted cash and investments |  | 164,673 | 168,426
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost |  | 94,598 | 90,095
Gross Unrealized Gain |  | 922 | 1,218
Gross Unrealized Loss |  | (322) | (247)
Fair Value |  | 95,198 | 91,066
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost |  | 94,598 | 90,095
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 95,198 | 91,066
Municipal debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 52,213 | 52,406
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost |  | 52,213 | 52,406
Gross Unrealized Gain |  | 664 | 882
Gross Unrealized Loss |  | (155) | (92)
Fair Value |  | 52,722 | 53,196
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost |  | 52,213 | 52,406
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 52,722 | 53,196
Corporate debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 33,683 | 27,715
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost |  | 33,683 | 27,715
Gross Unrealized Gain |  | 155 | 179
Gross Unrealized Loss |  | (134) | (144)
Fair Value |  | 33,704 | 27,750
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost |  | 33,683 | 27,715
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 33,704 | 27,750
Asset-backed securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 8,702 | 9,974
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost |  | 8,702 | 9,974
Gross Unrealized Gain |  | 103 | 157
Gross Unrealized Loss |  | (33) | (11)
Fair Value |  | 8,772 | 10,120
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Amortized Cost |  | 8,702 | 9,974
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 8,772 | $ 10,120
Restricted Cash and Investments |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 94,598 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Amortized Cost |  | 94,598 |
Fair Value |  | 95,198 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less |  | 10,129 |
Due after one year through five years |  | 47,209 |
Due after five years through ten years |  | 37,260 |
Amortized Cost |  | 94,598 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Due in one year or less |  | 10,200 |
Due after one year through five years |  | 47,407 |
Due after five years through ten years |  | 37,591 |
Fair Value |  | $ 95,198 |
[1] | Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds.

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