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Postretirement Obligations (Tables) - Other Postretirement Benefit Plans, Defined Benefit [Member]
 12 Months Ended
Sep. 24, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic postretirement benefit cost (benefit) components for our postretirement plans are as follows:
(Thousands of Dollars)
2017

 
2016

 
2015

 
 
 
 
 
 
Service cost for benefits earned during the year
13

 
63

 
76

Interest cost on projected benefit obligation
412

 
623

 
922

Expected return on plan assets
(1,056
)
 
(1,322
)
 
(1,445
)
Amortization of net actuarial gain
(987
)
 
(1,093
)
 
(1,386
)
Amortization of prior service benefit
(1,459
)
 
(1,459
)
 
(1,459
)
Curtailment gains
(3,741
)
 
—

 
—

Net periodic postretirement benefit
(6,818
)
 
(3,188
)
 
(3,292
)
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
Changes in benefit obligations and plan assets are as follows:
(Thousands of Dollars)
2017

 
2016

 
 
 
 
Benefit obligation, beginning of year
22,511

 
23,812

Service cost
13

 
63

Interest cost
412

 
623

Actuarial loss (gain)
(627
)
 
(773
)
Benefits paid, net of premiums received
(1,527
)
 
(1,434
)
Curtailment
(5,112
)
 
—

Medicare Part D subsidies
(3
)
 
220

Benefit obligation, end of year
15,667

 
22,511

Fair value of plan assets, beginning of year
24,123

 
30,123

Actual return on plan assets
2,112

 
1,085

Employer contributions
755

 
563

Benefits paid, net of premiums and Medicare Part D subsidies received
(1,530
)
 
(1,213
)
Benefits paid for active employees
(834
)
 
(1,510
)
Allocation to active medical plans
—

 
(4,925
)
Fair value of plan assets at measurement date
24,626

 
24,123

Funded status
8,959

 
1,612
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Disaggregated amounts recognized in the Consolidated Balance Sheets are as follows:
(Thousands of Dollars)
September 24
2017

 
September 25
2016

 
 
 
 
Non-current assets
11,020

 
9,138

Postretirement benefit obligations
(2,061
)
 
(7,527
)
Accumulated other comprehensive income (before income tax benefit)
18,782

 
19,026
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in accumulated other comprehensive income are as follows:
(Thousands of Dollars)
September 24
2017

 
September 25
2016

 
 
 
 
Unrecognized net actuarial gain
12,304

 
11,089

Unrecognized prior service benefit
6,478

 
7,937

 
18,782

 
19,026
Schedule of Assumptions Used [Table Text Block]
Weighted-average assumptions used to determine net periodic benefit cost are as follows:
(Percent)
2017

 
2016

 
2015

 
 
 
 
 
 
Discount rate
3.1

 
3.7

 
3.7

Expected long-term return on plan assets
4.5

 
4.5

 
4.5

Weighted-average assumptions used to determine post retirement benefit obligations are as follows:
(Percent)
September 24
2017
 
September 25
2016
 
 
 
 
Discount rate
3.4
 
3.1
Expected long-term return on plan assets
4.5
 
4.5
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates are as follows:
(Percent)
September 24
2017
 
September 25
2016
 
 
 
 
Health care cost trend rates
9.7
 
9.0
Rate to which the cost trend rate is assumed to decline (the “Ultimate Trend Rate”)
4.5
 
4.5
Year in which the rate reaches the Ultimate Trend Rate
2026
 
2025
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
A one percentage point change in assumed health care cost trend rates would have the following annualized effects on reported amounts for 2017:
 
One Percentage Point
 
(Thousands of Dollars)
Increase

 
Decrease

 
 
 
 
Effect on net periodic postretirement benefit
19

 
(17
)
Effect on postretirement benefit obligation
578

 
(526
)
Schedule of Allocation of Plan Assets [Table Text Block]
The weighted-average asset allocation of our postretirement assets is as follows:
(Percent)
Policy Allocation

Actual Allocation
Asset Class
September 24 2017

September 24
2017
September 25
2016
 
 
 
 
Equity securities
20

21
22
Debt securities
70

67
65
Hedge fund investment
10

12
11
Cash and cash equivalents
—

—
2
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
The fair value hierarchy of postretirement assets at September 24, 2017 is as follows:
(Thousands of Dollars)
NAV

Level 1

Level 2

Level 3

 
 
 
 
 
Cash and cash equivalents
—

—

—

—

Domestic equity securities
—

3,479

741

—

International equity securities
—

800

1,051

—

Debt securities
—

19,548

—

—

Hedge fund investment
3,343

—

—

—


The fair value hierarchy of postretirement assets at September 25, 2016 is as follows:
(Thousands of Dollars)
NAV

Level 1

Level 2

Level 3

 
 
 
 
 
Cash and cash equivalents
—

518

—

—

Domestic equity securities
—

3,342

1,572

—

International equity securities
—

695

898

—

Debt securities
—

18,840

—

—

Hedge fund investment
3,182

—

—

—
Schedule of Expected Benefit Payments [Table Text Block]
We anticipate future benefit payments to be paid either with future contributions to the plan or directly from plan assets, as follows:
(Thousands of Dollars)
Gross
Payments

 
Less
Medicare
Part D
Subsidy

 
Net
Payments

 
 
 
 
 
 
2018
3,474

 
(167
)
 
3,307

2019
1,393

 
(168
)
 
1,225

2020
1,372

 
(168
)
 
1,204

2021
1,340

 
(166
)
 
1,174

2022
1,298

 
(162
)
 
1,136

2023-2027
5,582

 
(695
)
 
4,887