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Pension & Postretirement Expenses (Tables)
 3 Months Ended
Dec. 31, 2018
Defined Benefit Plan [Abstract]  
Summary of Pension and Postretirement Plan Expenses
Total periodic pension and postretirement (income) expense is summarized below:
 
Three Months Ended December 31,
 
 
2017
 
 
2018
Service cost
 
$
19

 
 
18

Interest cost
 
46

 
 
50

Expected return on plan assets
 
(87
)
 
 
(88
)
Net amortization
 
31

 
 
17

Total
 
$
9

 
 
(3
)