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Fair Value Measurements (Fair Value Measurements on a Recurring Basis) (Details) - Fair value, measurements, recurring - USD ($)
$ in Thousands
Sep. 24, 2023
Dec. 25, 2022
Carrying value measurement    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Total asset recurring fair value measurements [1] $ 22,277 $ 8,087
Fair value, inputs, level 1    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Total asset recurring fair value measurements [1] 22,277 8,087
Fixed income funds | Carrying value measurement    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, fair value disclosure [1] 11,502 3,301
Fixed income funds | Fair value, inputs, level 1    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, fair value disclosure [1] 11,502 3,301
Money market funds | Carrying value measurement    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, fair value disclosure [1] 10,775 4,786
Money market funds | Fair value, inputs, level 1    
Fair Value, Assets on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents, fair value disclosure [1] $ 10,775 $ 4,786
[1] Carrying value approximates fair value because maturities are less than three months.