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Pension & Postretirement Expenses (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 
Nine Months Ended June 30,
 
 
2018
 
 
2019
 
 
2018

 
 
2019
Service cost
 
$
19

 
 
18

 
 
57

 
 
54

Interest cost
 
46

 
 
49

 
 
139

 
 
149

Expected return on plan assets
 
(87
)
 
 
(88
)
 
 
(262
)
 
 
(264
)
Net amortization
 
30

 
 
17

 
 
91

 
 
50

Total
 
$
8

 
 
(4
)
 
 
25

 
 
(11
)