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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands | Jan. 01, 2017 | Dec. 25, 2015
--- | --- | ---
Restricted Cash and Investments [Line Items] |  |
Cash collateral held by insurance carriers | $ 34,910 | $ 23,634
Cash and cash equivalents held in Trust | 32,841 | 26,046
Investments held in Trust | 146,517 | 126,788
Other | 16,925 | 11,944
Restricted cash and investments | 231,193 | 188,412
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 685 | 1,644
Gross Unrealized Loss | (1,249) | (187)
Fair Value | 145,953 | 128,245
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 145,953 | 128,245
Municipal debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 71,618 | 67,948
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 443 | 1,345
Gross Unrealized Loss | (865) | (4)
Fair Value | 71,196 | 69,289
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 71,196 | 69,289
Corporate debt securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 68,934 | 50,462
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 212 | 226
Gross Unrealized Loss | (352) | (152)
Fair Value | 68,794 | 50,536
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 68,794 | 50,536
Agency mortgage-backed securities |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 5,965 | 8,378
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Gross Unrealized Gain | 30 | 73
Gross Unrealized Loss | (32) | (31)
Fair Value | 5,963 | 8,420
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Fair Value | 5,963 | $ 8,420
Restricted Cash and Investments [Member] |  |
Restricted Cash and Investments [Line Items] |  |
Investments held in Trust | 146,517 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |
Fair Value | 145,953 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |
Due in one year or less | 15,640 |
Due after one year through five years | 73,973 |
Due after five years through ten years | 56,904 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |
Due in one year or less | 15,666 |
Due after one year through five years | 73,941 |
Due after five years through ten years | 56,346 |
Fair Value | $ 145,953 |

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