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Defined Benefit Pension and Other Postretirement Plans (Tables)
9 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Components of Net Periodic Pension Expense and Other Postretirement Benefit Costs Net periodic pension cost includes the following components:
 Pension Benefits
Three Months Ended June 30,20212020
Service cost$$
Interest cost
Expected return on assets(10)(10)
Amortization of:
Actuarial loss
Net cost$$
   
Nine Months Ended June 30,20212020
Service cost$$
Interest cost16 18 
Expected return on assets(30)(29)
Curtailment gain— (1)
Amortization of:
Actuarial loss11 11 
Net cost$$