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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Pension Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	$ 17,506	$ (37,132)
Amortization of net (gain) loss	3,255	5,999
Prior service credit (cost) arising during the period	285	250
Settlement (gain) loss	346	42,169
Amortization of prior service (credit) cost	(281)	36
Total	21,111	11,322
Postretirement Medical Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	2,153	237
Amortization of net (gain) loss	0	(133)
Prior service credit (cost) arising during the period	0	0
Settlement (gain) loss	0	0
Amortization of prior service (credit) cost	0	0
Total	$ 2,153	$ 104

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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