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Other Income, Net (Tables)
 12 Months Ended
Sep. 30, 2015
Component of Operating Income [Abstract]  
Schedule of Other Income, Net
Other income, net, comprises the following:
 
2015
 
2014
 
2013
Non-tariff service income
$
4,760

 
$
2,670

 
$
2,706

Construction service income
2,175

 
—

 
—

Sale of HVAC Business
1,065

 
—

 
—

Interest income
—

 
1,388

 
500

Other, net
869

 
301

 
1,622

Total other income, net
$
8,869

 
$
4,359

 
$
4,828