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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Mar. 25, 2016 | Dec. 25, 2015
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers |  | $ 26,532 | $ 23,634
Cash and cash equivalents held in Trust |  | 28,005 | 26,046
Investments held in Trust |  | 134,273 | 126,788
Other | [1] | 13,874 | 11,944
Restricted cash and investments |  | 202,684 | 188,412
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 2,629 | 1,644
Gross Unrealized Loss |  | (59) | (187)
Fair Value |  | 136,843 | 128,245
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 136,843 | 128,245
Municipal debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 65,967 | 67,948
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 1,702 | 1,345
Gross Unrealized Loss |  | 0 | (4)
Fair Value |  | 67,669 | 69,289
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 67,669 | 69,289
Corporate debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 60,570 | 50,462
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 842 | 226
Gross Unrealized Loss |  | (57) | (152)
Fair Value |  | 61,355 | 50,536
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 61,355 | 50,536
Agency mortgage-backed securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 7,736 | 8,378
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 85 | 73
Gross Unrealized Loss |  | (2) | (31)
Fair Value |  | 7,819 | 8,420
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 7,819 | $ 8,420
Restricted Cash and Investments |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 134,273 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Fair Value |  | 136,843 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less |  | 10,863 |
Due after one year through five years |  | 61,575 |
Due after five years through ten years |  | 61,835 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Due in one year or less |  | 10,897 |
Due after one year through five years |  | 62,277 |
Due after five years through ten years |  | 63,669 |
Fair Value |  | $ 136,843 |
[1] | Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.

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