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FAIR VALUE MEASUREMENT RECURRING (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 25, 2015
Fair Value Measurement [Line Items]        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 102,450 $ 73,831 $ 103,222 $ 79,811
Deferred compensation mutual funds classified as available-for-sale 23,363 22,428    
Restricted investments classified as held-to-maturity 155,641 172,238    
Quoted prices in active markets for identical assets (level 1)        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 46,988 28,780    
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 76,690 83,366    
Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 75,432 83,791    
Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 2,531 4,062    
U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 988 1,019    
Restricted Assets | Quoted prices in active markets for identical assets (level 1)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 55,462 45,051    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 102,450 73,831    
Deferred compensation mutual funds classified as available-for-sale 23,363 22,428    
Restricted investments classified as held-to-maturity 0 0    
Restricted Assets | Significant other observable inputs (level 2)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0    
Deferred compensation mutual funds classified as available-for-sale 0 0    
Restricted investments classified as held-to-maturity 155,641 172,238    
Restricted Assets | Significant unobservable inputs (level 3)        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0    
Deferred compensation mutual funds classified as available-for-sale 0 0    
Restricted investments classified as held-to-maturity 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 76,690 83,366    
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 75,432 83,791    
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 2,531 4,062    
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 988 1,019    
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    
Estimate of Fair Value Measurement [Member]        
Fair Value Measurement [Line Items]        
Cash and cash equivalents 46,988 28,780    
Estimate of Fair Value Measurement [Member] | Restricted Assets        
Fair Value Measurement [Line Items]        
Restricted cash and cash equivalents 55,462 45,051    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 102,450 73,831    
Deferred compensation mutual funds classified as available-for-sale 23,363 22,428    
Restricted investments classified as held-to-maturity 155,641 172,238    
Estimate of Fair Value Measurement [Member] | Restricted Assets | Municipal debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 76,690 83,366    
Estimate of Fair Value Measurement [Member] | Restricted Assets | Corporate debt securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 75,432 83,791    
Estimate of Fair Value Measurement [Member] | Restricted Assets | Agency mortgage-backed securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity 2,531 4,062    
Estimate of Fair Value Measurement [Member] | Restricted Assets | U.S. government and agency securities        
Fair Value Measurement [Line Items]        
Restricted investments classified as held-to-maturity $ 988 $ 1,019