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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2021	Sep. 25, 2020	Sep. 24, 2021	Sep. 25, 2020
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,674	$ 2,392	$ 7,119	$ 7,007
Interest cost	2,519	3,351	8,476	9,985
Expected return on assets	(5,412)	(4,706)	(15,673)	(14,107)
Amortization and other	2,148	2,777	7,254	8,015
Net periodic benefit cost	929	3,814	7,176	10,900
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	153	152	503	457
Interest cost	124	254	624	762
Amortization	252	183	752	550
Net periodic benefit cost	$ 529	$ 589	$ 1,879	$ 1,769

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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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