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Financial Instruments (Tables)
 9 Months Ended
Jun. 30, 2015
Financial Instruments, Owned, at Fair Value [Abstract]  
Long-Term Debt
Based on these criteria, the fair market value of long-term debt, including current portion, was as follows (in thousands): 
 
June 30, 2015
 
September 30, 2014
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Long-Term Debt
$
2,099,000

 
$
2,162,821

 
$
1,649,000

 
$
1,775,715
Schedule Of Derivative Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statement Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Three Months Ended June 30, 2015 and 2014 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships
Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) (Effective Portion) for the Three Months Ended June 30,
Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion)
Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion) for the Three Months Ended June 30,
Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) for the Three Months Ended June 30,
 
2015
2014
 
2015
2014
 
2015
2014
Commodity Contracts
$
(8,845
)
$
(13,832
)
Operating Revenue
$
50,878

$
(14,547
)
Operating Revenue
$
159

$
(3,593
)
Commodity Contracts
$
(84
)
$
611

Purchased Gas
$
(3
)
$
83

Not Applicable
$
—

$
—

Foreign Currency Contracts
$
(554
)
$
—

Not Applicable
$
—

$
—

Not Applicable
$
—

$
—

Total
$
(9,483
)
$
(13,221
)
 
$
50,875

$
(14,464
)
 
$
159

$
(3,593
)
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Nine Months Ended June 30, 2015 and 2014 (Thousands of Dollars)
Derivatives in Cash Flow Hedging Relationships
Amount of Derivative Gain or (Loss) Recognized in Other Comprehensive Income (Loss) on the Consolidated Statement of Comprehensive Income (Loss) (Effective Portion) for the Nine Months Ended June 30,
Location of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion)
Amount of Derivative Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) on the Consolidated Balance Sheet into the Consolidated Statement of Income (Effective Portion) for the Nine Months Ended June 30,
Location of Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Derivative Gain or (Loss) Recognized in the Consolidated Statement of Income (Ineffective Portion and Amount Excluded from Effectiveness Testing) for the Nine Months Ended June 30,
 
2015
2014
 
2015
2014
 
2015
2014
Commodity Contracts
$
291,749

$
(72,950
)
Operating Revenue
$
124,386

$
(27,372
)
Operating Revenue
$
3,088

$
(2,819
)
Commodity Contracts
$
4,316

$
(4,953
)
Purchased Gas
$
4,884

$
(3,549
)
Not Applicable
$
—

$
—

Foreign Currency Contracts
$
(554
)
$
—

Not Applicable
$
—

$
—

Not Applicable
$
—

$
—

Total
$
295,511

$
(77,903
)
 
$
129,270

$
(30,921
)
 
$
3,088

$
(2,819
)
 
 
 
 
 
 
 
 
 
Schedule Of Derivatives And Hedged Items In Fair Value Hedging Relationships
For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk completely offset each other in current earnings, as shown below.

Derivatives in Fair Value Hedging Relationships
Location of Gain or (Loss) on Derivative and Hedged Item Recognized in the Consolidated Statement of Income
Amount of Gain or (Loss) on Derivative Recognized in the Consolidated Statement of Income for the
Nine Months Ended June 30, 2015
(In Thousands)
Amount of Gain or (Loss) on the Hedged Item Recognized in the Consolidated Statement of Income for the
Nine Months Ended June 30, 2015
(In Thousands)
Commodity Contracts
Operating Revenues
$
(9,645
)
$
9,645

Commodity Contracts
Purchased Gas
$
(1
)
$
1

 
 
$
(9,646
)
$
9,646