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Pension, Postretirement and Postemployment Defined Benefit Plans (Tables)
3 Months Ended
Dec. 25, 2022
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension and Postretirement Cost (Benefit) Components
The net periodic pension and postretirement cost (benefit) components for our plans are as follows:
PENSION PLANSThree months ended
(Thousands of Dollars)December 25,
2022
December 26,
2021
Service cost for benefits earned during the period456 
Interest cost on projected benefit obligation2,592 1,936 
Expected return on plan assets(2,548)(4,536)
Amortization of net (gain) loss(1,259)
Amortization of prior service benefit213 — 
Curtailment gain— (1,027)
Pension benefit264 (4,430)
POSTRETIREMENT MEDICAL PLANSThree months ended
(Thousands of Dollars)December 25,
2022
December 26,
2021
Service cost for benefits earned during the period17 27 
Interest cost on projected benefit obligation149 85 
Expected return on plan assets(295)(263)
Amortization of net gain(254)(249)
Amortization of prior service benefit(162)(162)
Postretirement medical benefit(545)(562)