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Pension, Postretirement, and Postemployement Obligations (Tables)
 9 Months Ended
Jun. 26, 2016
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 26
2016

June 28
2015

June 26
2016

June 28
2015

 
 
 
 
 
Service cost for benefits earned during the period
49

226

147

678

Interest cost on projected benefit obligation
1,515

1,859

4,545

5,577

Expected return on plan assets
(2,174
)
(2,466
)
(6,522
)
(7,398
)
Amortization of net loss
599

420

1,797

1,260

Amortization of prior service benefit
(34
)
(34
)
(102
)
(102
)
Pension expense (benefit)
(45
)
5

(135
)
15

 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
39 Weeks Ended
 
(Thousands of Dollars)
June 26
2016

June 28
2015

June 26
2016

June 28
2015

 
 
 
 
 
Service cost for benefits earned during the period
16

39

48

117

Interest cost on projected benefit obligation
156

211

468

633

Expected return on plan assets
(331
)
(361
)
(993
)
(1,083
)
Amortization of net gain
(273
)
(347
)
(819
)
(1,041
)
Amortization of prior service benefit
(365
)
(365
)
(1,095
)
(1,095
)
Postretirement medical benefit
(797
)
(823
)
(2,391
)
(2,469
)