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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Dec. 30, 2022
Class of Stock      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense)   Other Nonoperating Income (Expense)
Pension Benefits      
Class of Stock      
Pension settlement losses $ (346) $ (42,169) $ 0
Pension Plan - Blue and Gray Plans | Pension Benefits      
Class of Stock      
Pension settlement losses   $ 42,000  
Cumulative Preferred Stock      
Class of Stock      
Preferred stock authorized (in shares) 22,549    
Preferred stock par value (in dollars per share) $ 100    
Preferred Stock      
Class of Stock      
Preferred stock authorized (in shares) 3,000,000    
Preferred stock par value (in dollars per share) $ 1