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Financial Instruments (Tables)
 6 Months Ended
Mar. 31, 2018
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): 
 
March 31, 2018
 
September 30, 2017
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Long-Term Debt
$
2,085,012

 
$
2,169,067

 
$
2,383,681

 
$
2,523,639
Schedule Of Other Investments
The components of the Company's Other Investments are as follows (in thousands):
 
At March 31, 2018
 
At September 30, 2017
 
 
 
 
Life Insurance Contracts
$
39,052

 
$
39,355

Equity Mutual Fund
36,910

 
37,033

Fixed Income Mutual Fund
44,192

 
45,727

Marketable Equity Securities
2,885

 
3,150

 
$
123,039

 
$
125,265
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 March 31, 2018 and 2017 (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 March 31,
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 March 31,
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 March 31,
 
2018
2017
 
2018
2017
 
2018
2017
Commodity Contracts
$
(10,514
)
$
42,484

Operating Revenue
$
(3,467
)
$
12,109

Operating Revenue
$
335

$
—

Commodity Contracts
(344
)
1,044

Purchased Gas
750

(1,498
)
Not Applicable
—

—

Foreign Currency Contracts
(1,724
)
569

Operation and Maintenance Expense
(482
)
(139
)
Not Applicable
—

—

Total
$
(12,582
)
$
44,097

 
$
(3,199
)
$
10,472

 
$
335

$
—

The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Six Months Ended March 31, 2018 and 2017 (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 Six Months Ended March 31,
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 Six Months Ended March 31,
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 Six Months Ended March 31,
 
2018
2017
 
2018
2017
 
2018
2017
Commodity Contracts
$
(16,463
)
$
(7,960
)
Operating Revenue
$
9,375

$
43,429

Operating Revenue
$
(98
)
$
(100
)
Commodity Contracts
613

(492
)
Purchased Gas
947

(1,958
)
Not Applicable
—

—

Foreign Currency Contracts
(2,231
)
48

Operation and Maintenance Expense
(973
)
(282
)
Not Applicable
—

—

Total
$
(18,081
)
$
(8,404
)
 
$
9,349

$
41,189

 
$
(98
)
$
(100
)
 
 
 
 
 
 
 
 
 
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
Six Months Ended March 31, 2018
(In Thousands)
Amount of Gain or (Loss) on the Hedged Item Recognized in the Consolidated Statement of Income for the
Six Months Ended March 31, 2018
(In Thousands)
Commodity Contracts
Operating Revenues
$
(838
)
$
838

Commodity Contracts
Purchased Gas
$
(196
)
$
196

 
 
$
(1,034
)
$
1,034