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FAIR VALUE MEASUREMENT - Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 29, 2026	Dec. 28, 2025	Mar. 30, 2025	Dec. 29, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash, cash equivalents, restricted cash and restricted cash equivalents	$ 44,313	$ 44,020	$ 64,156	$ 61,100
Restricted investments classified as held-to-maturity	64,729	71,016
Municipal debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	5,797	7,836
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	42,658	50,334
Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments classified as held-to-maturity	4,594	4,873
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	11,680	7,973
Fair value, recurring \| Total fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	24,132	24,510
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	20,181	19,510
Cash, cash equivalents, restricted cash and restricted cash equivalents	44,313	44,020
Restricted investments classified as held-to-maturity	64,729	71,016
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	5,797	7,836
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	42,658	50,334
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	4,594	4,873
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	11,680	7,973
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	24,132	24,510
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	20,181	19,510
Cash, cash equivalents, restricted cash and restricted cash equivalents	44,313	44,020
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	64,729	71,016
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	5,797	7,836
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	42,658	50,334
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	4,594	4,873
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	11,680	7,973
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