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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,467	$ 1,464
Interest cost	2,430	3,777
Expected return on assets	(2,444)	(3,975)
Amortization and other	936	440
Net periodic benefit cost	2,389	1,706
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	100	100
Interest cost	300	210
Amortization	(25)	90
Net periodic benefit cost	$ 375	$ 400

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