Other Postretirement Benefits - Changes in the Benefit Obligations Recognized in Other Comprehensive Income (Details) - Other Postretirement Benefit Plans - USD ($) $ in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Other Postretirement Benefits
Net actuarial loss/(gain)	$ 296	$ (4,905)	$ (6,625)
Amortization of loss	(3,375)	(4,735)	(3,621)
Amortization of prior service credit	4,766	6,157	7,755
Effect of curtailment	0	0	6,502
Effect of settlement	0	0	26,235
Total recognized in other comprehensive income	1,687	(3,483)	30,246
Net periodic postretirement benefit cost/(income)	238	75	(34,623)
Total recognized in net periodic postretirement benefit cost/(income) and other comprehensive loss/(income)	1,925	(3,408)	(4,377)
Estimated actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic pension cost over the next fiscal year	3,000
Estimated prior service cost that will be amortized from accumulated other comprehensive loss into net periodic pension cost over the next fiscal year	4,000
Additional postretirement costs	$ 15,000	$ 16,000	$ 15,000

Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), before Tax

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Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss), before Tax

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

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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 of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit.

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