XML 61 R45.htm IDEA: XBRL DOCUMENT v3.19.3
FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 25, 2019
Dec. 26, 2018
Sep. 26, 2018
Dec. 27, 2017
Debt Securities, Available-for-sale [Line Items]        
Document Period End Date Sep. 25, 2019      
Cost Basis $ 44,505 $ 24,750 $ 29,295 $ 21,507
Total cost basis including Mutual Funds 80,732 86,985    
Gross Unrealized Gains 109 0    
Gross Unrealized Losses 0 (122)    
Cash and cash equivalents fair value 44,505 24,750    
Fair value of marketable securities 36,336 62,113    
Fair Value 80,841 86,863    
Level 1 | Mutual funds        
Debt Securities, Available-for-sale [Line Items]        
Mutual funds 36,227 62,235    
Gross Unrealized Gains 109 0    
Gross Unrealized Losses (122)    
Fair value of marketable securities 36,336 62,113    
Cash        
Debt Securities, Available-for-sale [Line Items]        
Cost Basis 39,499 19,746    
Cash and cash equivalents fair value 39,499 19,746    
Money market funds | Level 1        
Debt Securities, Available-for-sale [Line Items]        
Cost Basis 5,006 5,004    
Cash and cash equivalents fair value $ 5,006 $ 5,004