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Summary of Significant Accounting Policies - (Marketable Securities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2023
Dec. 28, 2022
Dec. 29, 2021
Investment [Line Items]      
Marketable securities $ 1,281 $ 1,746  
Unrealized gain (loss) on marketable securities 2,100 (2,200) $ 2,200
Investments      
Investment [Line Items]      
Unrealized gain (loss) on marketable securities 100 (200) $ 100
Aggregated Cost      
Investment [Line Items]      
Marketable securities 1,200 1,900  
Estimate of Fair Value Measurement      
Investment [Line Items]      
Marketable securities $ 1,300 $ 1,700