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Pension, Postretirement, and Postemployement Obligations (Tables)
 9 Months Ended
Jun. 25, 2017
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 25
2017

June 26
2016

June 25
2017

June 26
2016

 
 
 
 
 
Service cost for benefits earned during the period
21

49

63

147

Interest cost on projected benefit obligation
1,349

1,515

4,047

4,545

Expected return on plan assets
(1,969
)
(2,174
)
(5,907
)
(6,522
)
Amortization of net loss
736

599

2,208

1,797

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

(45
)
309

(135
)
 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
39 Weeks Ended
 
(Thousands of Dollars)
June 25
2017

June 26
2016

June 25
2017

June 26
2016

 
 
 
 
 
Service cost for benefits earned during the period
—

16

12

48

Interest cost on projected benefit obligation
91

156

323

468

Expected return on plan assets
(264
)
(331
)
(792
)
(993
)
Amortization of net gain
(254
)
(273
)
(734
)
(819
)
Amortization of prior service benefit
(365
)
(365
)
(1,095
)
(1,095
)
Curtailment gains
—

—

(3,741
)
—

Postretirement medical benefit
(792
)
(797
)
(6,027
)
(2,391
)