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Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,392	$ 2,161	$ 7,007	$ 5,805
Interest cost	3,351	3,711	9,985	11,021
Expected return on assets	(4,706)	(4,289)	(14,107)	(12,864)
Amortization and other	2,777	3,095	8,015	6,912
Net periodic benefit cost	3,814	4,678	10,900	10,874
Postretirement Medical
Defined Benefit Plan Disclosure [Line Items]
Service cost	152	136	457	409
Interest cost	254	291	762	872
Amortization	183	68	550	205
Net periodic benefit cost	$ 589	$ 495	$ 1,769	$ 1,486

X

- 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.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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+ References

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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