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Defined Benefit Pension and Other Postretirement Plans (Tables)
6 Months Ended
Mar. 31, 2022
Retirement Benefits [Abstract]  
Components of Net Periodic Pension Cost Net periodic pension cost includes the following components:
Three Months Ended March 31,20222021
Service cost$$
Interest cost
Expected return on assets(13)(10)
Amortization of:
Actuarial loss
Net cost$— $
   
Six Months Ended March 31,20222021
Service cost$$
Interest cost13 11 
Expected return on assets(25)(20)
Amortization of:
Actuarial loss
Net cost$— $