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Other Operating Income (Expense), Net (Tables)
 12 Months Ended
Sep. 30, 2017
Component of Operating Income [Abstract]  
Schedule of Other Operating Income (Expense), Net
Other operating income (expense), net, comprises the following:
 
2017
 
2016
 
2015
Non-tariff service income
$
1,491

 
$
2,633

 
$
4,760

Environmental matters
6,155

 
(2,918
)
 
1,152

Construction service income
—

 
—

 
2,175

Sale of HVAC Business
—

 
—

 
1,065

Net interest on PGC overcollection
(130
)
 
(1,740
)
 
(606
)
Other, net
813

 
25

 
323

Total other operating income (expense), net
$
8,329

 
$
(2,000
)
 
$
8,869