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

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FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	12 Months Ended
FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Dec. 25, 2022	Dec. 26, 2021	Dec. 27, 2020	Mar. 29, 2020	Dec. 29, 2019
Total Fair Value
Fair Value Measurement [Line Items]
Cash and cash equivalents	$ 72,054	$ 49,896
Total Fair Value \| Restricted Assets
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	63,577	53,289
Cash, cash equivalents and restricted cash	135,631	103,185
Restricted investments classified as held-to-maturity	119,525	138,084
Total Fair Value \| Restricted Assets \| Municipal debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	42,431	58,505
Total Fair Value \| Restricted Assets \| Corporate debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	76,097	78,357
Total Fair Value \| Restricted Assets \| Agency mortgage-backed securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	48	152
Total Fair Value \| Restricted Assets \| U.S. government and agency securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	949	1,070
Total Fair Value \| Fair Value, Nonrecurring [Member]
Fair Value Measurement [Line Items]
Goodwill and intangible assets				$ 46,405
Goodwill, fair value				31,705
Finite-lived intangible assets, fair value				14,700
Cash, cash equivalents and restricted cash	135,631	103,185	$ 118,612		$ 92,371
Restricted investments classified as held-to-maturity	119,525	138,084
Goodwill and intangible asset impairment charge	0	0	(175,189)
Goodwill, impairment charge			(140,500)
Impairment of finite-lived intangible assets			(34,700)
Municipal debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	42,431	58,505
Corporate debt securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	76,097	78,357
Agency mortgage-backed securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	48	152
U.S. government and agency securities
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	949	1,070
Restricted Assets \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	135,631	103,185
Restricted investments classified as held-to-maturity	0	0
Restricted Assets \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	0	0
Restricted investments classified as held-to-maturity	119,525	138,084
Restricted Assets \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Cash, cash equivalents and restricted cash	0	0
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Cash and cash equivalents	72,054	49,896
Fair Value, Recurring \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Fair Value, Recurring \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Cash and cash equivalents	0	0
Fair Value, Recurring \| Restricted Assets \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	63,577	53,289
Fair Value, Recurring \| Restricted Assets \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Fair Value, Recurring \| Restricted Assets \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted cash and cash equivalents	0	0
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	42,431	58,505
Fair Value, Recurring \| Restricted Assets \| Municipal debt securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	76,097	78,357
Fair Value, Recurring \| Restricted Assets \| Corporate debt securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	48	152
Fair Value, Recurring \| Restricted Assets \| Agency mortgage-backed securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	949	1,070
Fair Value, Recurring \| Restricted Assets \| U.S. government and agency securities \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Restricted investments classified as held-to-maturity	$ 0	$ 0
Fair Value, Nonrecurring [Member]
Fair Value Measurement [Line Items]
Goodwill and intangible assets				221,600
Goodwill and intangible asset impairment charge			(175,189)
Goodwill, impairment charge			(140,489)
Impairment of finite-lived intangible assets			$ (34,700)
Fair Value, Nonrecurring [Member] \| Quoted prices in active markets for identical assets (level 1)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				0
Goodwill, fair value				0
Finite-lived intangible assets, fair value				0
Fair Value, Nonrecurring [Member] \| Significant other observable inputs (level 2)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				0
Goodwill, fair value				0
Finite-lived intangible assets, fair value				0
Fair Value, Nonrecurring [Member] \| Significant unobservable inputs (level 3)
Fair Value Measurement [Line Items]
Goodwill and intangible assets				46,405
Goodwill, fair value				31,705
Finite-lived intangible assets, fair value				$ 14,700