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Summary of Significant Accounting Policies, Cloud Computing Arrangements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 26, 2023
Dec. 27, 2022
Dec. 28, 2021
Summary of Significant Accounting Policies.      
Capitalized cloud computing implementation costs $ 3.0 $ 1.9  
Related amortization expense $ 1.4 $ 1.0 $ 0.2