RESTRICTED CASH AND INVESTMENTS (Details) $ in Thousands	12 Months Ended
Dec. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Restricted Cash and Investments [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions \| security	93	83
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 36,743	$ 73,392
Cash collateral held by insurance carriers	24,182	22,926
Cash and cash equivalents held in Trust	28,021	16,113
Investments held in Trust	156,618	171,752
Deferred compensation mutual funds classified as available-for-sale	23,363	22,428
Other	3,259	6,012
Restricted cash and investments	235,443	239,231
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross Unrealized Gain	491	1,324
Gross Unrealized Loss	(1,468)	(838)
Fair Value	155,641	172,238
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	155,641	172,238
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(362)	(445)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	68,476	20,600
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,106)	(393)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	105,219	93,992
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(1,468)	(838)
Unrealized loss	3,400
Municipal debt securities
Restricted Cash and Investments [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	12,803	23,078
Investments held in Trust	76,750	82,770
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross Unrealized Gain	456	974
Gross Unrealized Loss	(516)	(378)
Fair Value	76,690	83,366
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	76,690	83,366
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(74)	(124)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	22,638	9,631
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(442)	(254)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	35,441	32,709
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(516)	(378)
Corporate debt securities
Restricted Cash and Investments [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	22,567	48,952
Investments held in Trust	76,310	83,916
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross Unrealized Gain	30	309
Gross Unrealized Loss	(908)	(434)
Fair Value	75,432	83,791
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	75,432	83,791
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(277)	(311)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	44,463	10,081
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(631)	(123)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	67,030	59,033
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(908)	(434)
Agency mortgage-backed securities
Restricted Cash and Investments [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	385	1,362
Investments held in Trust	2,559	4,066
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross Unrealized Gain	5	22
Gross Unrealized Loss	(33)	(26)
Fair Value	2,531	4,062
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	2,531	4,062
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(10)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,375	888
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(33)	(16)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,760	2,250
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(33)	(26)
U.S. government and agency securities
Restricted Cash and Investments [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	988
Investments held in Trust	999	1,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross Unrealized Gain	0	19
Gross Unrealized Loss	(11)	0
Fair Value	988	1,019
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Fair Value	988	$ 1,019
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(11)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	988
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	(11)
Restricted Cash and Investments
Restricted Cash and Investments [Line Items]
Investments held in Trust	156,618
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Fair Value	155,641
Held-to-maturity Securities, Investment Maturities, Amortized Cost [Abstract]
Due in one year or less	27,158
Due after one year through five years	86,606
Due after five years through ten years	42,854
Held-to-maturity Securities, Investment Maturities, Fair Value [Abstract]
Due in one year or less	27,014
Due after one year through five years	86,107
Due after five years through ten years	42,520
Fair Value	$ 155,641

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