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Retirement Benefits (Amounts included in accumulated other comprehensive (income) loss) (Details) - USD ($) $ in Thousands	Dec. 27, 2024	Dec. 29, 2023
Pension Benefits
Amounts recognized in accumulated ther comprehensive income
Prior service cost	$ 2,026	$ 2,163
Net gain (loss)	(22,954)	(44,195)
Net before income taxes	(20,928)	(42,032)
Income taxes	4,549	9,464
Net	(16,379)	(32,568)
Postretirement Medical Benefits
Amounts recognized in accumulated ther comprehensive income
Prior service cost	0	0
Net gain (loss)	4,148	1,995
Net before income taxes	4,148	1,995
Income taxes	(914)	(439)
Net	$ 3,234	$ 1,556

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The net of tax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The tax effect of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for 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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