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Pension & Postretirement Expenses
 3 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
Pension & Postretirement Plans PENSION & POSTRETIREMENT PLANS
Total periodic pension and postretirement (income) expense is summarized below:
 Three Months Ended December 31,
 2019 2020 
Service cost$22 21 
Interest cost40 32 
Expected return on plan assets
(84)(84)
Net amortization37 35 
Total$15 4