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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,102	$ 1,438	$ 3,822	$ 4,369
Interest cost	2,256	3,632	6,890	11,207
Expected return on assets	(2,543)	(6,399)	(7,610)	(14,354)
Amortization and other	835	3,041	2,478	3,896
Net periodic benefit cost	1,650	1,712	5,580	5,118
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	91	61	258	261
Interest cost	305	454	861	874
Amortization	53	(280)	0	(100)
Net periodic benefit cost	$ 449	$ 235	$ 1,119	$ 1,035

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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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