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Other Postretirement Benefits (Tables) - Other Postretirement Benefit Plans [Member]
 12 Months Ended
Dec. 30, 2018
Other Postretirement Benefits  
Schedule of Components of Net Periodic Postretirement Benefit Cost
The components of net periodic postretirement benefit cost/(income) were as follows:
(In thousands)
 
December 30,
2018

 
December 31,
2017

 
December 25,
2016

Service cost
 
$
21

 
$
367

 
$
417

Interest cost
 
1,476

 
1,881

 
1,979

Amortization and other costs
 
4,735

 
3,621

 
4,105

Amortization of prior service credit
 
(6,157
)
 
(7,755
)
 
(8,440
)
Effect of settlement/curtailment(1)
 
—

 
(32,737
)
 
—

Net periodic postretirement benefit cost/(income)
 
$
75

 
$
(34,623
)
 
$
(1,939
)

(1) In the fourth quarter of 2017, the Company recorded a gain in connection with the settlement of a funding obligation related to a postretirement plan.
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The changes in the benefit obligations recognized in other comprehensive (income)/loss were as follows:
(In thousands)
 
December 30,
2018

 
December 31,
2017

 
December 25,
2016

Net actuarial loss/(gain)
 
$
(4,905
)
 
$
(6,625
)
 
$
28

Amortization of loss
 
(4,735
)
 
(3,621
)
 
(4,105
)
Amortization of prior service credit
 
6,157

 
7,755

 
8,440

Effect of curtailment
 
—

 
6,502

 
—

Effect of settlement
 
—

 
26,235

 
—

Total recognized in other comprehensive (income)/loss
 
(3,483
)
 
30,246

 
4,363

Net periodic postretirement benefit cost/(income)
 
75

 
(34,623
)
 
(1,939
)
Total recognized in net periodic postretirement benefit cost/(income) and other comprehensive (income)/loss
 
$
(3,408
)
 
$
(4,377
)
 
$
2,424
Schedule of Changes in Projected Benefit Obligations and Plan Assets
The changes in the benefit obligation and plan assets and other amounts recognized in other comprehensive income/loss were as follows:
(In thousands)
 
December 30,
2018

 
December 31,
2017

Change in benefit obligation
 
 
 
 
Benefit obligation at beginning of year
 
$
54,642

 
$
65,042

Service cost
 
21

 
367

Interest cost
 
1,476

 
1,881

Plan participants’ contributions
 
3,974

 
4,007

Actuarial (gain)/loss
 
(4,905
)
 
3,703

Curtailments/settlements
 
—

 
(10,328
)
Benefits paid
 
(9,171
)
 
(10,030
)
Benefit obligation at the end of year
 
46,037

 
54,642

Change in plan assets
 
 
 
 
Fair value of plan assets at beginning of year
 
—

 
—

Employer contributions
 
5,197

 
6,023

Plan participants’ contributions
 
3,974

 
4,007

Benefits paid
 
(9,171
)
 
(10,030
)
Fair value of plan assets at end of year
 
—

 
—

Net amount recognized
 
$
(46,037
)
 
$
(54,642
)
Amount recognized in the Consolidated Balance Sheets
 
 
 
 
Current liabilities
 
$
(5,645
)
 
$
(5,826
)
Noncurrent liabilities
 
(40,392
)
 
(48,816
)
Net amount recognized
 
$
(46,037
)
 
$
(54,642
)
Amount recognized in accumulated other comprehensive loss
 
 
 
 
Actuarial loss
 
$
28,871

 
$
38,512

Prior service credit
 
(12,456
)
 
(18,613
)
Total
 
$
16,415

 
$
19,899
Schedule of Assumptions Used
Weighted-average assumptions used in the actuarial computations to determine the postretirement benefit obligations were as follows:
 
 
December 30,
2018

 
December 31,
2017

Discount rate
 
4.18
%
 
3.46
%
Estimated increase in compensation level
 
3.50
%
 
3.50
%
Weighted-average assumptions used in the actuarial computations to determine net periodic postretirement cost were as follows:
 
 
December 30,
2018

 
December 31,
2017

 
December 25,
2016

Discount rate for determining projected benefit obligation
 
3.46
%
 
3.93
%
 
4.05
%
Discount rate in effect for determining service cost
 
3.56
%
 
4.08
%
 
4.24
%
Discount rate in effect for determining interest cost
 
3.01
%
 
3.21
%
 
2.96
%
Estimated increase in compensation level
 
3.50
%
 
3.50
%
 
3.50
%
Schedule of Health Care Cost Trend Rates
The assumed health-care cost trend rates were as follows:
 
 
December 30,
2018

 
December 31,
2017

Health-care cost trend rate
 
6.90
%
 
7.60
%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
 
5.00
%
 
5.00
%
Year that the rate reaches the ultimate trend rate
 
2025

 
2025
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A one-percentage point change in assumed health-care cost trend rates would have the following effects:
 
 
One-Percentage Point
(In thousands)
 
Increase

 
Decrease

Effect on total service and interest cost for 2018
 
$
40

 
$
(36
)
Effect on accumulated postretirement benefit obligation as of December 30, 2018
 
$
1,139

 
$
(1,021
)
Schedule of Expected Benefit Payments
The following benefit payments (net of plan participant contributions) under our Company’s postretirement plans, which reflect expected future services, are expected to be paid:
(In thousands)
Amount

2019
$
5,802

2020
5,394

2021
4,962

2022
4,545

2023
4,196

2024-2028(1)
16,662


(1) 
While benefit payments under these plans are expected to continue beyond 2028, we have presented in this table only those benefit payments estimated over the next 10 years.