XML 93 R68.htm IDEA: XBRL DOCUMENT v3.20.4
FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Dec. 27, 2017
Debt Securities, Available-for-sale [Line Items]        
Cost Basis $ 146,873 $ 37,099 $ 24,750 $ 21,507
Cash and cash equivalents fair value 146,873 37,099    
Gross Unrealized Gains 13 72    
Gross Unrealized Losses 0 0    
Fair value of marketable securities 36,887 36,508    
Total cost basis 183,747 73,535    
Total fair value 183,760 73,607    
Level 1: | Mutual Fund        
Debt Securities, Available-for-sale [Line Items]        
Cost Basis 36,874 36,436    
Cash and cash equivalents fair value 36,887 36,508    
Gross Unrealized Gains 13 72    
Gross Unrealized Losses      
Fair value of marketable securities 36,887 36,508    
Cash        
Debt Securities, Available-for-sale [Line Items]        
Cost Basis 146,873 32,094    
Cash and cash equivalents fair value 146,873 32,094    
Money market funds | Level 1:        
Debt Securities, Available-for-sale [Line Items]        
Cost Basis 0 5,005    
Cash and cash equivalents fair value $ 0 $ 5,005