RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 25, 2015	Dec. 26, 2014
Restricted Cash and Investments [Line Items]
Cash collateral held by insurance carriers	$ 22,717	$ 22,639
Cash and cash equivalents held in Trust	31,227	43,856
Investments held in Trust	116,319	90,095
Other	11,647	11,836
Restricted cash and investments	181,910	168,426
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized Cost	116,319	90,095
Gross Unrealized Gain	1,309	1,218
Gross Unrealized Loss	(109)	(247)
Fair Value	117,519	91,066
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Amortized Cost	116,319	90,095
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	117,519	91,066
Municipal debt securities
Restricted Cash and Investments [Line Items]
Investments held in Trust	62,289	52,406
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized Cost	62,289	52,406
Gross Unrealized Gain	918	882
Gross Unrealized Loss	(19)	(92)
Fair Value	63,188	53,196
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Amortized Cost	62,289	52,406
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	63,188	53,196
Corporate debt securities
Restricted Cash and Investments [Line Items]
Investments held in Trust	44,978	27,715
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized Cost	44,978	27,715
Gross Unrealized Gain	284	179
Gross Unrealized Loss	(81)	(144)
Fair Value	45,181	27,750
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Amortized Cost	44,978	27,715
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	45,181	27,750
Asset-backed securities
Restricted Cash and Investments [Line Items]
Investments held in Trust	9,052	9,974
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized Cost	9,052	9,974
Gross Unrealized Gain	107	157
Gross Unrealized Loss	(9)	(11)
Fair Value	9,150	10,120
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Amortized Cost	9,052	9,974
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	9,150	$ 10,120
Restricted Cash and Investments
Restricted Cash and Investments [Line Items]
Investments held in Trust	116,319
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized Cost	116,319
Fair Value	117,519
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Due in one year or less	10,503
Due after one year through five years	62,654
Due after five years through ten years	43,162
Amortized Cost	116,319
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Due in one year or less	10,577
Due after one year through five years	63,118
Due after five years through ten years	43,824
Fair Value	$ 117,519

Held-to-maturity Securities, Adjustments for Fair Value Calculation [Abstract]

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Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Other long-term assets not otherwise listed in the existing taxonomy that are pledged or subject to withdrawal restrictions.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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