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Pension, Postretirement, and Postemployement Obligations (Tables)
 3 Months Ended
Dec. 30, 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
 
(Thousands of Dollars)
December 30
2018

December 24
2017

 
 
 
Service cost for benefits earned during the period
9

12

Interest cost on projected benefit obligation
1,641

1,438

Expected return on plan assets
(2,018
)
(1,983
)
Amortization of net loss
284

506

Amortization of prior service benefit
(25
)
(34
)
Pension benefit
(109
)
(61
)
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
(Thousands of Dollars)
December 30
2018

December 24
2017

 
 
 
Service cost for benefits earned during the period
—

—

Interest cost on projected benefit obligation
103

90

Expected return on plan assets
(270
)
(270
)
Amortization of net gain
(244
)
(246
)
Amortization of prior service benefit
(181
)
(196
)
Postretirement medical benefit
(592
)
(622
)