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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Balance Sheet Location and Fair Value of Derivative Assets and Liabilities
The following table presents the Company’s derivative assets and liabilities, as well as the effects of offsetting, as of March 31, 2017, September 30, 2016 and March 31, 2016:
 
 
March 31, 2017
 
September 30, 2016
 
March 31, 2016
Derivative assets:
 
 
 
 
 
 
Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
$
2,104

 
$
4,472

 
$
1,179

Derivatives not subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
53

 
38

 
—

Total derivative assets — gross
 
2,157

 
4,510

 
1,179

Gross amounts offset in the balance sheet
 
(133
)
 
(247
)
 
(298
)
Total derivative assets — net
 
$
2,024

 
$
4,263

 
$
881

 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
Derivatives subject to PGC and DS mechanisms:
 
 

 
 
 
 

Commodity contracts
 
$
(150
)
 
$
(499
)
 
$
(3,466
)
Derivatives not subject to PGC and DS mechanisms:
 
 

 
 
 
 

Commodity contracts
 
(2
)
 
(58
)
 
(202
)
Total derivative liabilities — gross
 
(152
)
 
(557
)
 
(3,668
)
Gross amounts offset in the balance sheet
 
133

 
247

 
298

Total derivative liabilities — net
 
$
(19
)
 
$
(310
)
 
$
(3,370
)
Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest
The following table provides information on the effects of derivative instruments not subject to ratemaking mechanisms on the Condensed Consolidated Statements of Income and changes in AOCI for the three and six months ended March 31, 2017 and 2016:
 
 
Loss Recognized in AOCI
 
Loss Reclassified from AOCI into Income
 
Location of Loss Reclassified from AOCI into Income
Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
 
Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
$
—

 
$
(32,168
)
 
$
(822
)
 
$
(609
)
 
Interest expense
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Loss Recognized in Income
 
Location of Loss Recognized in Income
 
 
 
 
Three Months Ended March 31,
 
2017
 
2016
 
 
 
 
 
 
 
 
Derivatives Not Subject to PGC and DS Mechanisms:
 
 
 
 
 
 
 
 
 
 
 
 
Gasoline contracts
 
$
(98
)
 
$
(55
)
 
Operating and administrative expenses
 

 
 
 
 
 
 
 
 
 
 
 
 
 
Loss Recognized in AOCI
 
Loss Reclassified from AOCI into Income
 
Location of Loss Reclassified from AOCI into Income
Six Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
 
Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
$
—

 
$
(28,959
)
 
$
(1,668
)
 
$
(1,275
)
 
Interest expense
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss) Recognized in Income
 
Location of Gain (Loss) Recognized in Income
 
 
 
 
Six Months Ended March 31,
 
2017
 
2016
 
 
 
 
 
 
 
 
Derivatives Not Subject to PGC and DS Mechanisms:
 
 
 
 
 
 
 
 
 
 
 
 
Gasoline contracts
 
$
32

 
$
(120
)
 
Operating and administrative expenses