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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,438	$ 2,053	$ 4,369	$ 6,187
Interest cost	3,632	2,745	11,207	8,249
Expected return on assets	(6,399)	(5,237)	(14,354)	(14,816)
Amortization and other	3,041	1,200	3,896	3,695
Net periodic benefit cost	1,712	761	5,118	3,315
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	61	129	261	387
Interest cost	454	209	874	629
Amortization	(280)	86	(100)	259
Net periodic benefit cost	$ 235	$ 424	$ 1,035	$ 1,275

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- Definition

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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