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RESTRICTED CASH AND INVESTMENTS - Held-to-Maturity Investments (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Restricted Cash and Investments [Line Items]
Amortized cost	$ 149,373	$ 156,618
Gross unrealized gain	3,394	491
Gross unrealized losses	(36)	(1,468)
Fair value	152,731	155,641
Municipal debt securities
Restricted Cash and Investments [Line Items]
Amortized cost	72,017	76,750
Gross unrealized gain	2,219	456
Gross unrealized losses	0	(516)
Fair value	74,236	76,690
Corporate debt securities
Restricted Cash and Investments [Line Items]
Amortized cost	75,000	76,310
Gross unrealized gain	1,102	30
Gross unrealized losses	(34)	(908)
Fair value	76,068	75,432
Agency mortgage-backed securities
Restricted Cash and Investments [Line Items]
Amortized cost	1,357	2,559
Gross unrealized gain	21	5
Gross unrealized losses	(2)	(33)
Fair value	1,376	2,531
U.S. government and agency securities
Restricted Cash and Investments [Line Items]
Amortized cost	999	999
Gross unrealized gain	52	0
Gross unrealized losses	0	(11)
Fair value	$ 1,051	$ 988

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

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