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Postretirement Obligations (Tables) - Other Postretirement Benefit Plans, Defined Benefit [Member]
 12 Months Ended
Sep. 25, 2016
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)
2016

 
2015

 
2014

 
 
 
 
 
 
Service cost for benefits earned during the year
63

 
76

 
596

Interest cost on projected benefit obligation
623

 
922

 
911

Expected return on plan assets
(1,322
)
 
(1,445
)
 
(1,483
)
Amortization of net actuarial gain
(1,093
)
 
(1,386
)
 
(1,819
)
Amortization of prior service benefit
(1,459
)
 
(1,459
)
 
(1,459
)
Net periodic postretirement benefit
(3,188
)
 
(3,292
)
 
(3,254
)
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)
2016

 
2015

 
 
 
 
Benefit obligation, beginning of year
23,812

 
25,506

Service cost
63

 
76

Interest cost
623

 
922

Actuarial loss (gain)
(773
)
 
(1,149
)
Benefits paid, net of premiums received
(1,434
)
 
(1,541
)
Medicare Part D subsidies
220

 
(2
)
Benefit obligation, end of year
22,511

 
23,812

Fair value of plan assets, beginning of year
30,123

 
32,881

Actual return on plan assets
1,085

 
(547
)
Employer contributions
563

 
745

Benefits paid, net of premiums and Medicare Part D subsidies received
(1,213
)
 
(1,544
)
Benefits paid for active employees
(1,510
)
 
(1,412
)
Allocation to active medical plans
(4,925
)
 
—

Fair value of plan assets at measurement date
24,123

 
30,123

Funded status - benefit obligation less than plan assets
(1,612
)
 
(6,311
)
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 25
2016

 
September 27
2015

 
 
 
 
Non-current assets
9,138

 
13,420

Postretirement benefit obligations
7,527

 
7,109

Accumulated other comprehensive income (before income tax benefit)
19,026

 
22,551
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 25
2016

 
September 27
2015

 
 
 
 
Unrecognized net actuarial gain
11,089

 
13,155

Unrecognized prior service benefit
7,937

 
9,396

 
19,026

 
22,551
Schedule of Assumptions Used [Table Text Block]
Weighted-average assumptions used to determine net periodic benefit cost are as follows:
(Percent)
2016

 
2015

 
2014

 
 
 
 
 
 
Discount rate
3.7

 
3.7

 
4.0

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 25
2016
 
September 27
2015
 
 
 
 
Discount rate
3.1
 
3.7
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 25
2016
 
September 27
2015
 
 
 
 
Health care cost trend rates
9.0
 
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
2025
 
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 2016:
 
One Percentage Point
 
(Thousands of Dollars)
Increase

 
Decrease

 
 
 
 
Effect on net periodic postretirement benefit
20

 
(18
)
Effect on postretirement benefit obligation
697

 
(629
)
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 25 2016

September 25
2016
September 27
2015
 
 
 
 
Equity securities
20

22
19
Debt securities
70

65
68
Hedge fund investment
10

11
10
Cash and cash equivalents
—

2
3
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
The fair value hierarchy of postretirement assets at September 25, 2016 is as follows:
(Thousands of Dollars)
NAV

Level 1

Level 2

 
 
 
 
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

—

—


The fair value hierarchy of postretirement assets at September 27, 2015 is as follows:
(Thousands of Dollars)
NAV

Level 1

Level 2

 
 
 
 
Cash and cash equivalents
—

790

—

Domestic equity securities
—

2,896

1,372

International equity securities
—

645

857

Debt securities
—

13,910

6,581

Hedge fund investment
3,072

—

—
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

 
 
 
 
 
 
2017
3,600

 
(200
)
 
3,400

2018
1,870

 
(210
)
 
1,660

2019
1,910

 
(210
)
 
1,700

2020
1,880

 
(210
)
 
1,670

2021
1,790

 
(200
)
 
1,590

2022-2026
7,910

 
(870
)
 
7,040