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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2025	Mar. 29, 2024
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,253	$ 1,467
Interest cost	2,143	2,430
Expected return on assets	(2,903)	(2,444)
Amortization and other	164	936
Net periodic benefit cost	657	2,389
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	75	100
Interest cost	200	300
Amortization	0	(25)
Net periodic benefit cost	$ 275	$ 375

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