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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Sep. 23, 2016 | Dec. 25, 2015
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |  |
Cash collateral held by insurance carriers |  | $ 27,172 | $ 23,634
Cash and cash equivalents held in Trust |  | 21,101 | 26,046
Investments held in Trust |  | 148,811 | 126,788
Other | [1] | 15,884 | 11,944
Restricted cash and investments |  | 212,968 | 188,412
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 3,803 | 1,644
Gross Unrealized Loss |  | (51) | (187)
Fair Value |  | 152,563 | 128,245
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 152,563 | 128,245
Municipal debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 72,776 | 67,948
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 2,186 | 1,345
Gross Unrealized Loss |  | (37) | (4)
Fair Value |  | 74,925 | 69,289
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 74,925 | 69,289
Corporate debt securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 69,552 | 50,462
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 1,510 | 226
Gross Unrealized Loss |  | (13) | (152)
Fair Value |  | 71,049 | 50,536
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 71,049 | 50,536
Agency mortgage-backed securities |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 6,483 | 8,378
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Gross Unrealized Gain |  | 107 | 73
Gross Unrealized Loss |  | (1) | (31)
Fair Value |  | 6,589 | 8,420
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Fair Value |  | 6,589 | $ 8,420
Restricted Cash and Investments [Member] |  |  |
Restricted Cash and Investments [Line Items] |  |  |
Investments held in Trust |  | 148,811 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |
Fair Value |  | 152,563 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |
Due in one year or less |  | 14,051 |
Due after one year through five years |  | 76,590 |
Due after five years through ten years |  | 58,170 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |
Due in one year or less |  | 14,092 |
Due after one year through five years |  | 77,854 |
Due after five years through ten years |  | 60,617 |
Fair Value |  | $ 152,563 |
[1] | Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.

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