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Employee Benefit Plans - (Change in Benefit Obligation and Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2023
Dec. 28, 2022
Dec. 29, 2021
Change in Benefit Obligation:      
Benefit obligation at beginning of year $ 1,606 $ 2,219  
Interest cost 53 36 $ 26
Actuarial gain (29) (261)  
Benefits paid (131) (151)  
Settlements (421) (237)  
Benefit obligation at end of year 1,078 1,606 2,219
Accumulated benefit obligation 1,078 1,606  
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 552 388  
Benefits paid (131) (151)  
Settlements (421) (237)  
Fair value of plan assets at end of year 0 0 $ 0
Unfunded status at end of year (1,078) (1,606)  
Amounts recognized on the balance sheet:      
Other current liabilities  (582) (972)  
Other noncurrent liabilities (496) (634)  
Net amount recognized  (1,078) (1,606)  
Amounts in accumulated other comprehensive loss not yet reflected in net period benefit cost:      
Unamortized actuarial losses, net (449) (516)  
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss, net:      
Benefit obligation actuarial gain (loss) (98) 261  
Amortization of net loss 56 123  
Settlement loss recognized 35 74  
Plan closure loss 74 0  
Other comprehensive income $ 67 $ 458