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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2023	Dec. 30, 2022
Pension Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	$ (37,132)	$ 11,189
Amortization of net (gain) loss	5,999	4,701
Prior service credit (cost) arising during the period	250	267
Settlement (gain) loss	42,169	0
Amortization of prior service (credit) cost	36	84
Total	11,322	16,241
Postretirement Medical Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	237	9,044
Amortization of net (gain) loss	(133)	345
Prior service credit (cost) arising during the period	0	0
Settlement (gain) loss	0	0
Amortization of prior service (credit) cost	0	0
Total	$ 104	$ 9,389

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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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