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FAIR VALUE MEASUREMENT - Fair Value Measurement (Details) - USD ($)
$ in Thousands
Sep. 28, 2025
Dec. 29, 2024
Sep. 29, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 50,789 $ 61,100 $ 49,276 $ 99,306
Restricted investments classified as held-to-maturity 73,620 98,592    
Municipal debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments classified as held-to-maturity 7,891 22,355    
Corporate debt securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments classified as held-to-maturity 55,645 63,512    
Agency mortgage-backed securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted investments classified as held-to-maturity 5,124 11,754    
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 4,960 971    
Fair value, recurring | Total fair value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 19,893 22,536    
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 30,896 38,564    
Cash, cash equivalents, restricted cash and restricted cash equivalents 50,789 61,100    
Restricted investments classified as held-to-maturity 73,620 98,592    
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 7,891 22,355    
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 55,645 63,512    
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 5,124 11,754    
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 4,960 971    
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 19,893 22,536    
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 30,896 38,564    
Cash, cash equivalents, restricted cash and restricted cash equivalents 50,789 61,100    
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 73,620 98,592    
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 7,891 22,355    
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 55,645 63,512    
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 5,124 11,754    
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 4,960 971    
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