Pension Benefits - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Pension Benefits
Net actuarial (gain)/loss	$ (4,172)	$ (10,292)	$ 29,965
Prior service cost	0	706	0
Amortization of loss	(27,959)	(23,020)	(31,916)
Amortization of prior service credit	1,894	1,932	1,945
Effect of settlement	(80,641)	0	(421)
Total recognized in other comprehensive income	(110,878)	(30,674)	(427)
Net periodic pension cost	99,857	12,324	18,083
Total recognized in net periodic benefit (income)/cost and other comprehensive (income)/loss	(11,021)	(18,350)	17,656
Defined contribution plan, cost recognized	$ 27,000	$ 27,000	$ 22,000

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

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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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