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Pension, Postretirement, and Postemployement Obligations (Tables)
 6 Months Ended
Mar. 25, 2018
Pension Postretirement And Postemployment Defined Benefit Plans [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic postretirement cost (benefit) components for our postretirement plans are as follows:
PENSION PLANS
13 Weeks Ended
 
26 Weeks Ended
 
(Thousands of Dollars)
March 25
2018

March 26
2017

March 25
2018

March 26
2017

 
 
 
 
 
Service cost for benefits earned during the period
12

21

24

42

Interest cost on projected benefit obligation
1,438

1,349

2,876

2,698

Expected return on plan assets
(1,983
)
(1,969
)
(3,966
)
(3,938
)
Amortization of net loss
506

736

1,012

1,472

Amortization of prior service benefit
(34
)
(34
)
(68
)
(68
)
Pension expense (benefit)
(61
)
103

(122
)
206

 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
26 Weeks Ended
 
(Thousands of Dollars)
March 25
2018

March 26
2017

March 25
2018

March 26
2017

 
 
 
 
 
Service cost for benefits earned during the period
—

9

—

12

Interest cost on projected benefit obligation
90

110

181

232

Expected return on plan assets
(270
)
(264
)
(540
)
(528
)
Amortization of net gain
(246
)
(243
)
(492
)
(480
)
Amortization of prior service benefit
(196
)
(365
)
(392
)
(730
)
Curtailment gains
(2,031
)
(3,741
)
(2,031
)
(3,741
)
Postretirement medical benefit
(2,653
)
(4,494
)
(3,274
)
(5,235
)