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Postretirement Obligations (Tables) - Other Postretirement Benefit Plans, Defined Benefit [Member]
 12 Months Ended
Sep. 27, 2015
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)
2015

 
2014

 
2013

 
 
 
 
 
 
Service cost for benefits earned during the year
76

 
596

 
728

Interest cost on projected benefit obligation
922

 
911

 
1,125

Expected return on plan assets
(1,445
)
 
(1,483
)
 
(1,474
)
Amortization of net actuarial gain
(1,386
)
 
(1,819
)
 
(1,324
)
Amortization of prior service benefit
(1,459
)
 
(1,459
)
 
(1,459
)
Net periodic postretirement benefit
(3,292
)
 
(3,254
)
 
(2,404
)
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)
2015

 
2014

 
 
 
 
Benefit obligation, beginning of year
25,506

 
23,432

Service cost
76

 
596

Interest cost
922

 
911

Actuarial loss (gain)
(1,149
)
 
2,298

Benefits paid, net of premiums received
(1,541
)
 
(1,905
)
Medicare Part D subsidies
(2
)
 
174

Benefit obligation, end of year
23,812

 
25,506

Fair value of plan assets, beginning of year
32,881

 
33,920

Actual return on plan assets
(547
)
 
1,167

Employer contributions
745

 
597

Benefits paid, net of premiums and Medicare Part D subsidies received
(1,544
)
 
(1,731
)
Benefits paid for active employees
(1,412
)
 
(1,072
)
Fair value of plan assets at measurement date
30,123

 
32,881

Funded status - benefit obligation less than plan assets
(6,311
)
 
(7,375
)
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 27
2015

 
September 28
2014

 
 
 
 
Non-current assets
13,420

 
14,136

Postretirement benefit obligations
7,109

 
6,761

Accumulated other comprehensive income (before income tax benefit)
22,551

 
27,250
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 27
2015

 
September 28
2014

 
 
 
 
Unrecognized net actuarial gain
13,155

 
16,394

Unrecognized prior service benefit
9,396

 
10,856

 
22,551

 
27,250
Schedule of Assumptions Used [Table Text Block]
Weighted-average assumptions used to determine post retirement benefit obligations are as follows:
(Percent)
September 27
2015
 
September 28
2014
 
 
 
 
Discount rate
3.7
 
3.7
Expected long-term return on plan assets
4.5
 
4.5
Weighted-average assumptions used to determine net periodic benefit cost are as follows:
(Percent)
2015

 
2014

 
2013

 
 
 
 
 
 
Discount rate
3.7

 
4.0

 
3.85

Expected long-term return on plan assets
4.5

 
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 27
2015
 
September 28
2014
 
 
 
 
Health care cost trend rates
9.0
 
7.5
Rate to which the cost trend rate is assumed to decline (the “Ultimate Trend Rate”)
4.5
 
5.0
Year in which the rate reaches the Ultimate Trend Rate
2025
 
2018
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 2015:
 
One Percentage Point
 
(Thousands of Dollars)
Increase

 
Decrease

 
 
 
 
Effect on net periodic postretirement benefit
29

 
(26
)
Effect on postretirement benefit obligation
831

 
(748
)
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 27 2015

September 27
2015
September 28
2014
 
 
 
 
Equity securities
20

19
22
Debt securities
70

68
74
Hedge fund investment
10

10
 
Cash and cash equivalents
—

3
4
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
The fair value hierarchy of postretirement assets at September 27, 2015 is as follows:
(Thousands of Dollars)
Level 1

Level 2

Level 3

 
 
 
 
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

 
 
 
 
 
 
2015
3,320

 
(260
)
 
3,060

2016
2,130

 
(260
)
 
1,870

2017
2,040

 
(260
)
 
1,780

2018
2,070

 
(260
)
 
1,810

2019
2,040

 
(260
)
 
1,780

2020-2024
9,180

 
(1,140
)
 
8,040