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Pension & Postretirement Expenses
 9 Months Ended
Jun. 30, 2020
Defined Benefit Plan [Abstract]  
Pension & Postretirement Plans PENSION & POSTRETIREMENT PLANS
Total periodic pension and postretirement (income) expense is summarized below:
 Three Months Ended June 30,Nine Months Ended June 30,
 2019  2020  2019  2020  
Service cost$18  21  54  65  
Interest cost49  40  149  120  
Expected return on plan assets
(88) (84) (264) (252) 
Net amortization17  38  50  113  
Total$(4) 15  (11) 46