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Pension & Postretirement Plans
9 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Pension & Postretirement Plans PENSION & POSTRETIREMENT PLANSTotal periodic pension and postretirement (income) expense is summarized below:
 Three Months Ended June 30,Nine Months Ended June 30,
 2020 2021 2020 2021 
Service cost$21 21 65 63 
Interest cost40 32 120 96 
Expected return on plan assets
(84)(84)(252)(252)
Net amortization38 35 113 105 
Total$15 4 46 12