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RESTRICTED CASH AND INVESTMENTS (Details) (USD $) | Mar. 28, 2014 | Dec. 27, 2013
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Restricted Cash and Investments [Line Items] |  |  |  |
Cash collateral held by insurance carriers | $ 23,000,000 |  | $ 23,700,000 |
Cash and cash equivalents held in Trust | 37,100,000 | [1] | 31,500,000 | [1]
Investments held in Trust | 81,900,000 |  | 86,700,000 |
Cash collateral backing letters of credit | 1,900,000 |  | 1,900,000 |
Other | 7,500,000 | [2] | 10,800,000 | [2]
Restricted cash and investments | 151,381,000 |  | 154,558,000 |
Accrued interest on trust investments | 800,000 |  | 800,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 81,900,000 |  | 86,700,000 |
Gross Unrealized Gain | 1,200,000 |  | 1,000,000 |
Gross Unrealized Loss | (500,000) |  | (800,000) |
Fair Value | 82,600,000 |  | 86,900,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 81,900,000 |  | 86,700,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 82,600,000 |  | 86,900,000 |
Municipal debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 50,200,000 |  | 54,100,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 50,200,000 |  | 54,100,000 |
Gross Unrealized Gain | 800,000 |  | 700,000 |
Gross Unrealized Loss | (300,000) |  | (400,000) |
Fair Value | 50,700,000 |  | 54,400,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 50,200,000 |  | 54,100,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 50,700,000 |  | 54,400,000 |
Corporate debt securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 19,600,000 |  | 19,700,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 19,600,000 |  | 19,700,000 |
Gross Unrealized Gain | 200,000 |  | 200,000 |
Gross Unrealized Loss | (200,000) |  | (300,000) |
Fair Value | 19,600,000 |  | 19,600,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 19,600,000 |  | 19,700,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 19,600,000 |  | 19,600,000 |
Asset-backed securities |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 12,100,000 |  | 12,900,000 |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 12,100,000 |  | 12,900,000 |
Gross Unrealized Gain | 200,000 |  | 100,000 |
Gross Unrealized Loss | 0 |  | (100,000) |
Fair Value | 12,300,000 |  | 12,900,000 |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Amortized Cost | 12,100,000 |  | 12,900,000 |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Fair Value | 12,300,000 |  | 12,900,000 |
Restricted Cash and Investments |  |  |  |
Restricted Cash and Investments [Line Items] |  |  |  |
Investments held in Trust | 81,900,000 |  |  |
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract] |  |  |  |
Amortized Cost | 81,900,000 |  |  |
Fair Value | 82,600,000 |  |  |
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract] |  |  |  |
Due in one year or less | 10,900,000 |  |  |
Due after one year through five years | 41,200,000 |  |  |
Due after five years through ten years | 29,800,000 |  |  |
Amortized Cost | 81,900,000 |  |  |
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract] |  |  |  |
Due in one year or less | 10,900,000 |  |  |
Due after one year through five years | 41,900,000 |  |  |
Due after five years through ten years | 29,800,000 |  |  |
Fair Value | $ 82,600,000 |  |  |
[1] | Included in this amount is $0.8 million of accrued interest at March 28, 2014 and December 27, 2013.
[2] | Consists of restricted cash in money market accounts and deferred compensation plan accounts, which are comprised of mutual funds.

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