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Marketable Securities - Maturities (Details) - USD ($)
$ in Thousands
Sep. 25, 2021
Dec. 26, 2020
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract]    
Amortized Cost, Due within one year $ 7,948  
Amortized Cost, Due after one year through five years 52,149  
Amortized Cost, Due after five years through ten years 46,807  
Amortized Cost 106,904 $ 99,861
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Fair Value, Due within one year 8,021  
Fair Value, Due after one year through five years 54,463  
Fair Value, Due after five years through ten years 48,053  
Fair Value $ 110,537 $ 104,445