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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,039	$ 1,253	$ 2,292	$ 2,720
Interest cost	2,568	2,204	4,711	4,634
Expected return on assets	(2,904)	(2,623)	(5,807)	(5,067)
Amortization and other	202	707	366	1,643
Net periodic benefit cost	905	1,541	1,562	3,930
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	78	67	153	167
Interest cost	369	256	569	556
Amortization	(136)	(28)	(136)	(53)
Net periodic benefit cost	$ 311	$ 295	$ 586	$ 670

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The amount of gains or losses recognized in net periodic benefit cost. This element may be used to encapsulate any other periodic costs associated with defined benefit plans that are not separately disclosed.

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