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Pension & Postretirement Expenses (Tables)
3 Months Ended
Dec. 31, 2019
Defined Benefit Plan [Abstract]  
Schedule of Pension and Postretirement Plan Expenses

Total periodic pension and postretirement (income) expense is summarized below:
 
Three Months Ended December 31,
 
 
2018
 
 
2019
Service cost
 
$
18

 
 
22

Interest cost
 
50

 
 
40

Expected return on plan assets
 
(88
)
 
 
(84
)
Net amortization
 
17

 
 
37

Total
 
$
(3
)
 
 
15