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Other Operating (Expense) Income, Net (Tables)
 12 Months Ended
Sep. 30, 2016
Component of Operating Income [Abstract]  
Schedule of Other Operating (Expense) Income, Net
Other operating (expense) income, net, comprises the following:
 
2016
 
2015
 
2014
Non-tariff service income
$
2,633

 
$
4,760

 
$
2,670

Environmental matters
(2,918
)
 
1,152

 
297

Construction service income
—

 
2,175

 
—

Sale of HVAC Business
—

 
1,065

 
—

PGC interest on over (under) collection
(1,740
)
 
(606
)
 
1,388

Other, net
25

 
323

 
4

Total other operating (expense) income, net
$
(2,000
)
 
$
8,869

 
$
4,359