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Retirement Benefits (Amounts recognized in other comprehensive (income) loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021
Pension Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	$ 11,189	$ 42,039
Amortization of net (gain) loss	4,701	9,248
Prior service credit (cost) arising during the period	267	1,458
Settlement (gain) loss	0	12,285
Amortization of prior service (credit) cost	84	246
Total	16,241	65,276
Postretirement Medical Benefits
Amounts recognized in other comprehensive (income) loss
Net gain (loss) arising during the period	9,044	2,391
Amortization of net (gain) loss	345	1,002
Prior service credit (cost) arising during the period	0	0
Settlement (gain) loss	0	0
Amortization of prior service (credit) cost	0	0
Total	$ 9,389	$ 3,393

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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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