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FAIR VALUE MEASUREMENT - Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 26, 2023	Dec. 25, 2022	Mar. 27, 2022	Dec. 26, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 109,590	$ 135,631	$ 93,776	$ 103,185
Restricted investments classified as held-to-maturity	120,241	119,525
Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	41,330	42,431
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	77,910	76,097
Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	962	48
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	39	949
Fair value, recurring | Total fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	47,223	72,054
Fair value, recurring | Total fair value | Restricted assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash and cash equivalents	62,367	63,577
Cash, cash equivalents, restricted cash and restricted cash equivalents	109,590	135,631
Restricted investments classified as held-to-maturity	120,241	119,525
Fair value, recurring | Total fair value | Restricted assets | Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	41,330	42,431
Fair value, recurring | Total fair value | Restricted assets | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	77,910	76,097
Fair value, recurring | Total fair value | Restricted assets | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	962	48
Fair value, recurring | Total fair value | Restricted assets | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	39	949
Fair value, recurring | Quoted prices in active markets for identical assets (level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	47,223	72,054
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash and cash equivalents	62,367	63,577
Cash, cash equivalents, restricted cash and restricted cash equivalents	109,590	135,631
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Quoted prices in active markets for identical assets (level 1) | Restricted assets | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Significant other observable inputs (level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash and cash equivalents	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents	0	0
Restricted investments classified as held-to-maturity	120,241	119,525
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	41,330	42,431
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	77,910	76,097
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	962	48
Fair value, recurring | Significant other observable inputs (level 2) | Restricted assets | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	39	949
Fair value, recurring | Significant unobservable inputs (level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash and cash equivalents	0	0
Cash, cash equivalents, restricted cash and restricted cash equivalents	0	0
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	0	0
Fair value, recurring | Significant unobservable inputs (level 3) | Restricted assets | U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	$ 0	$ 0

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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

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