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Pension, Postretirement, and Postemployement Obligations (Tables)
 9 Months Ended
Jun. 24, 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
 
39 Weeks Ended
 
(Thousands of Dollars)
June 24
2018

June 25
2017

June 24
2018

June 25
2017

 
 
 
 
 
Service cost for benefits earned during the period
12

21

36

63

Interest cost on projected benefit obligation
1,438

1,349

4,314

4,047

Expected return on plan assets
(1,983
)
(1,969
)
(5,949
)
(5,907
)
Amortization of net loss
506

736

1,518

2,208

Amortization of prior service benefit
(34
)
(34
)
(102
)
(102
)
Pension expense (benefit)
(61
)
103

(183
)
309

 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
39 Weeks Ended
 
(Thousands of Dollars)
June 24
2018

June 25
2017

June 24
2018

June 25
2017

 
 
 
 
 
Service cost for benefits earned during the period
—

—

—

12

Interest cost on projected benefit obligation
90

91

271

323

Expected return on plan assets
(270
)
(264
)
(810
)
(792
)
Amortization of net gain
(246
)
(254
)
(738
)
(734
)
Amortization of prior service benefit
(196
)
(365
)
(588
)
(1,095
)
Curtailment gains
—

—

(2,031
)
(3,741
)
Postretirement medical benefit
(622
)
(792
)
(3,896
)
(6,027
)