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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Jun. 30, 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 June 30, 2017, September 30, 2016 and June 30, 2016:
 
 
June 30, 2017
 
September 30, 2016
 
June 30, 2016
Derivative assets:
 
 
 
 
 
 
Derivatives subject to PGC and DS mechanisms:
 
 
 
 
 
 
Commodity contracts
 
$
1,163

 
$
4,472

 
$
5,718

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

 
38

 
—

Total derivative assets — gross
 
1,163

 
4,510

 
5,718

Gross amounts offset in the balance sheet
 
(159
)
 
(247
)
 
(225
)
Total derivative assets — net (a)
 
$
1,004

 
$
4,263

 
$
5,493

 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
Derivatives subject to PGC and DS mechanisms:
 
 

 
 
 
 

Commodity contracts
 
$
(1,204
)
 
$
(499
)
 
$
(593
)
Derivatives not subject to PGC and DS mechanisms:
 
 

 
 
 
 

Commodity contracts
 
(21
)
 
(58
)
 
(139
)
Total derivative liabilities — gross
 
(1,225
)
 
(557
)
 
(732
)
Gross amounts offset in the balance sheet
 
159

 
247

 
225

Total derivative liabilities — net (a)
 
$
(1,066
)
 
$
(310
)
 
$
(507
)
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 nine months ended June 30, 2017 and 2016:
 
 
Loss Recognized in AOCI
 
Loss Reclassified from AOCI into Income
 
Location of Loss Reclassified from AOCI into Income
Three Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
$
—

 
$
—

 
$
(856
)
 
$
(610
)
 
Interest expense
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gain (Loss) Recognized in Income
 
Location of Gain (Loss) Recognized in Income
 
 
 
 
Three Months Ended June 30,
 
2017
 
2016
 
 
 
 
 
 
 
 
Derivatives Not Subject to PGC and DS Mechanisms:
 
 
 
 
 
 
 
 
 
 
 
 
Gasoline contracts
 
$
(57
)
 
$
27

 
Operating and administrative expenses
 

 
 
 
 
 
 
 
 
 
 
 
 
 
Loss Recognized in AOCI
 
Loss Reclassified from AOCI into Income
 
Location of Loss Reclassified from AOCI into Income
Nine Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate contracts
 
$
—

 
$
(28,959
)
 
$
(2,524
)
 
$
(1,885
)
 
Interest expense
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Loss Recognized in Income
 
Location of Loss Recognized in Income
 
 
 
 
Nine Months Ended June 30,
 
2017
 
2016
 
 
 
 
 
 
 
 
Derivatives Not Subject to PGC and DS Mechanisms:
 
 
 
 
 
 
 
 
 
 
 
 
Gasoline contracts
 
$
(25
)
 
$
(93
)
 
Operating and administrative expenses