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Marketable Securities - Maturities (Details) - USD ($)
$ in Thousands
Jun. 26, 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 $ 7,086  
Amortized Cost, Due after one year through five years 45,031  
Amortized Cost, Due after five years through ten years 52,320  
Amortized Cost 104,437 $ 99,861
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling Maturity, Fair Value [Abstract]    
Fair Value, Due within one year 7,123  
Fair Value, Due after one year through five years 46,693  
Fair Value, Due after five years through ten years 54,397  
Fair Value $ 108,213 $ 104,445