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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Tables)
 12 Months Ended
Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
Unaudited Quarterly Financial Information
2015
 
First
 
Second
 
Third
 
Fourth
 
Total
Operating revenues
$
2,411

 
$
2,863

 
$
2,558

 
$
3,171

 
$
11,003

Operating expenses
2,047

 
2,087

 
2,252

 
2,402

 
8,788

Operating income
364

 
776

 
306

 
769

 
2,215

Net income (loss)
81

 
496

 
32

 
502

 
1,111


Unaudited Quarterly Financial Information
2014
 
First
 
Second
 
Third
 
Fourth
 
Total
Operating revenues
$
2,382

 
$
2,938

 
$
2,651

 
$
3,166

 
$
11,137

Operating expenses
2,164

 
2,362

 
2,453

 
2,569

 
9,548

Operating income
218

 
576

 
198

 
597

 
1,589

Net income (loss)
(67
)
 
295

 
(81
)
 
322

 
469