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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020
Pension Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	$ 42,039	$ (8,872)
Amortization of net (gain) loss	9,248	10,243
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	1,458	529
Settlement (gain) loss	12,285	0
Amortization of prior service (credit) cost	246	294
Total	65,276	2,194
Postretirement Medical Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	(2,391)	3,572
Amortization of net (gain) loss	1,002	733
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Settlement (gain) loss	0	0
Amortization of prior service (credit) cost	0	0
Total	$ 3,393	$ (2,839)

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan.

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