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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2024	Jun. 30, 2023	Jun. 28, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,253	$ 1,467	$ 2,720	$ 2,931
Interest cost	2,204	3,798	4,634	7,575
Expected return on assets	(2,623)	(3,980)	(5,067)	(7,955)
Amortization and other	707	415	1,643	855
Net periodic benefit cost	1,541	1,700	3,930	3,406
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	67	100	167	200
Interest cost	256	210	556	420
Amortization	(28)	90	(53)	180
Net periodic benefit cost	$ 295	$ 400	$ 670	$ 800

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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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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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