Pension Benefits - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Pension Benefits
Net actuarial gain	$ (25,585)	$ (4,172)	$ (10,292)
Prior service cost	0	0	706
Amortization of loss	(27,500)	(27,959)	(23,020)
Amortization of prior service credit	1,890	1,894	1,932
Effect of settlement	0	(80,641)	0
Total recognized in other comprehensive income	(51,195)	(110,878)	(30,674)
Net periodic pension cost	18,805	99,857	12,324
Total recognized in net periodic pension benefit cost and other comprehensive income	(32,390)	(11,021)	(18,350)
Defined contribution plan, cost recognized	$ 33,000	$ 27,000	$ 27,000

Defined benefit plan amounts recognized in other comprehensive income and net periodic benefit cost.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for defined contribution plan.

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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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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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