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Pension, Postretirement, and Postemployement Obligations (Tables)
 6 Months Ended
Mar. 27, 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
 
26 Weeks Ended
 
(Thousands of Dollars)
March 27
2016

March 29
2015

March 27
2016

March 29
2015

 
 
 
 
 
Service cost for benefits earned during the period
49

226

98

452

Interest cost on projected benefit obligation
1,515

1,859

3,030

3,718

Expected return on plan assets
(2,174
)
(2,466
)
(4,348
)
(4,932
)
Amortization of net loss
599

420

1,198

840

Amortization of prior service benefit
(34
)
(34
)
(68
)
(68
)
Pension expense (benefit)
(45
)
5

(90
)
10

 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
26 Weeks Ended
 
(Thousands of Dollars)
March 27
2016

March 29
2015

March 27
2016

March 29
2015

 
 
 
 
 
Service cost for benefits earned during the period
16

39

32

78

Interest cost on projected benefit obligation
156

211

312

422

Expected return on plan assets
(331
)
(361
)
(662
)
(722
)
Amortization of net gain
(273
)
(347
)
(546
)
(694
)
Amortization of prior service benefit
(365
)
(365
)
(730
)
(730
)
Postretirement medical benefit
(797
)
(823
)
(1,594
)
(1,646
)