RESTRICTED CASH AND INVESTMENTS (Details) $ in Thousands	3 Months Ended
Mar. 29, 2020 USD ($) security	Mar. 31, 2019 USD ($)	Dec. 29, 2019 USD ($) security
Restricted Cash and Investments [Line Items]
Cash collateral held by insurance carriers	$ 24,684		$ 24,612
Cash and cash equivalents held in Trust	26,641		23,681
Investments held in Trust	142,761		149,373
Amortized cost of held-to-maturity investments	142,779		149,373
Deferred compensation investments	11,546		13,670
Company owned life insurance policies	10,284		13,126
Other restricted cash and cash equivalents	2,991		6,470
Restricted cash and investments	218,907		230,932
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross unrealized gains	2,984		3,394
Gross unrealized losses	(311)		(36)
Fair value	145,452		152,731
Estimated fair value
Less than 12 months	23,488		15,920
12 months or more	0		3,041
Total	23,488		18,961
Unrealized losses
Less than 12 months	(311)		(32)
12 months or more	0		(4)
Total	$ (311)		$ (36)
Number of securities in unrealized loss positions \| security	16		17
Held-to-maturity securities, fair value [Abstract]
Fair value	$ 145,452		$ 152,731
Unrealized loss	(2,900)
Unrealized gain		$ 2,400
Municipal debt securities
Restricted Cash and Investments [Line Items]
Amortized cost of held-to-maturity investments	71,124		72,017
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross unrealized gains	1,969		2,219
Gross unrealized losses	0		0
Fair value	73,093		74,236
Held-to-maturity securities, fair value [Abstract]
Fair value	73,093		74,236
Corporate debt securities
Restricted Cash and Investments [Line Items]
Amortized cost of held-to-maturity investments	69,539		75,000
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross unrealized gains	908		1,102
Gross unrealized losses	(311)		(34)
Fair value	70,136		76,068
Estimated fair value
Less than 12 months	23,488		15,920
12 months or more	0		2,765
Total	23,488		18,685
Unrealized losses
Less than 12 months	(311)		(32)
12 months or more	0		(2)
Total	(311)		(34)
Held-to-maturity securities, fair value [Abstract]
Fair value	70,136		76,068
Agency mortgage-backed securities
Restricted Cash and Investments [Line Items]
Amortized cost of held-to-maturity investments	1,116		1,357
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross unrealized gains	39		21
Gross unrealized losses	0		(2)
Fair value	1,155		1,376
Estimated fair value
Less than 12 months			0
12 months or more			276
Total			276
Unrealized losses
Less than 12 months			0
12 months or more			(2)
Total			(2)
Held-to-maturity securities, fair value [Abstract]
Fair value	1,155		1,376
U.S. government and agency securities
Restricted Cash and Investments [Line Items]
Amortized cost of held-to-maturity investments	1,000		999
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Gross unrealized gains	68		52
Gross unrealized losses	0		0
Fair value	1,068		1,051
Held-to-maturity securities, fair value [Abstract]
Fair value	1,068		$ 1,051
Restricted cash and investments
Restricted Cash and Investments [Line Items]
Amortized cost of held-to-maturity investments	142,779
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Fair value	145,452
Held-to-maturity securities, amortized cost [Abstract]
Due in one year or less	26,080
Due after one year through five years	88,541
Due after five years through ten years	28,158
Held-to-maturity securities, fair value [Abstract]
Due in one year or less	26,145
Due after one year through five years	90,049
Due after five years through ten years	29,258
Fair value	$ 145,452

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