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Other Operating Income (Expense), Net (Tables)
 12 Months Ended
Sep. 30, 2018
Component of Operating Income [Abstract]  
Schedule of Other Operating Income (Expense), Net
Other operating income (expense), net, comprises the following:
 
2018
 
2017
 
2016
Non-tariff service income
$
2,830

 
$
1,491

 
$
2,633

Environmental matters
—

 
6,155

 
(2,918
)
Net interest on PGC overcollections
(1,403
)
 
(130
)
 
(1,740
)
Other, net
837

 
813

 
25

Total other operating income (expense), net
$
2,264

 
$
8,329

 
$
(2,000
)