XML 63 R47.htm IDEA: XBRL DOCUMENT v3.20.4
Marketable Securities - Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities by Maturity (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Investments Debt And Equity Securities [Abstract]    
Amortized Cost, Due in one year or less $ 386,010  
Amortized Cost, Due after one year through five years 1,049,200  
Amortized Cost, Due after five years through ten years 53,831  
Amortized Cost, Due after ten years 3,729  
Amortized Cost 1,492,770 $ 1,578,937
Fair Value, Due in one year or less 387,642  
Fair Value, Due after one year through five years 1,071,892  
Fair Value, Due after five years through ten years 55,813  
Fair Value, Due after ten years 3,470  
Fair Value, Total $ 1,518,817 $ 1,581,938