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FAIR VALUE MEASUREMENT - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Fair Value Measurement [Line Items]        
Cash, cash equivalents and restricted cash $ 92,371 $ 102,450 $ 73,831 $ 103,222
Restricted investments classified as held-to-maturity 152,731 155,641    
Deferred compensation investments 13,670 22,621    
Quoted prices in active markets for identical assets (level 1)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 37,608 46,988    
Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 0 0    
Significant unobservable inputs (level 3)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 0 0    
Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 74,236 76,690    
Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,068 75,432    
Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,376 2,531    
U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,051 988    
Restricted Assets | Quoted prices in active markets for identical assets (level 1)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 54,763 55,462    
Cash, cash equivalents and restricted cash 92,371 102,450    
Restricted investments classified as held-to-maturity 0 0    
Deferred compensation investments 13,670 22,621    
Restricted Assets | Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, cash equivalents and restricted cash 0 0    
Restricted investments classified as held-to-maturity 152,731 155,641    
Deferred compensation investments 0 0    
Restricted Assets | Significant unobservable inputs (level 3)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, cash equivalents and restricted cash 0 0    
Restricted investments classified as held-to-maturity 0 0    
Deferred compensation investments 0 0    
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    
Restricted Assets | Municipal debt securities | Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 74,236 76,690    
Restricted Assets | Municipal debt securities | Significant unobservable inputs (level 3)        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
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    
Restricted Assets | Corporate debt securities | Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,068 75,432    
Restricted Assets | Corporate debt securities | Significant unobservable inputs (level 3)        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 0 0    
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    
Restricted Assets | Agency mortgage-backed securities | Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,376 2,531    
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    
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    
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 1,051 988    
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    
Total Fair Value        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 37,608 46,988    
Total Fair Value | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 54,763 55,462    
Cash, cash equivalents and restricted cash 92,371 102,450    
Restricted investments classified as held-to-maturity 152,731 155,641    
Deferred compensation investments 13,670 22,621    
Total Fair Value | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 74,236 76,690    
Total Fair Value | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,068 75,432    
Total Fair Value | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 1,376 2,531    
Total Fair Value | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity $ 1,051 $ 988