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Financial Instruments (Tables)
 12 Months Ended
Sep. 30, 2017
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:
 
 
At September 30
 
2017 Carrying
Amount
 
2017 Fair
Value
 
2016 Carrying
Amount
 
2016 Fair
Value
 
(Thousands)
Long-Term Debt
$
2,383,681

 
$
2,523,639

 
$
2,086,252

 
$
2,255,562
Schedule Of Derivatives Financial Instruments Designated And Qualifying As Cash Flow Hedges On The Statements Of Financial Performance
The Effect of Derivative Financial Instruments on the Statement of Financial Performance for the
Year Ended September 30, 2017 and 2016 (Dollar Amounts in Thousands)
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 Year Ended
September 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 Year Ended
September 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 Year Ended September 30,
 
 
2017
 
2016
 
 
 
2017
 
2016
 
 
 
2017
 
2016
Commodity Contracts
 
$
2,811

 
$
58,714

 
Operating Revenue
 
$
83,983

 
$
216,823

 
Operating Revenue
 
$
(100
)
 
$
392

Commodity Contracts
 
(164
)
 
1,585

 
Purchased Gas
 
(1,921
)
 
4,520

 
Not Applicable
 
—

 
—

Foreign Currency Contracts
 
2,700

 
194

 
Operation and Maintenance Expense
 
(457
)
 
(424
)
 
Not Applicable
 
—

 
—

Total
 
$
5,347

 
$
60,493

 
 
 
$
81,605

 
$
220,919

 
 
 
$
(100
)
 
$
392
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 Year Ended
September 30, 2017
 
Amount of Gain or
(Loss) on Hedged Item
Recognized in the
Consolidated
Statement of Income
for the Year Ended
September 30, 2017
 
 
 
 
(In thousands)
Commodity Contracts
 
Operating Revenues
 
$
1,655

 
$
(1,655
)
Commodity Contracts
 
Purchased Gas
 
464

 
(464
)
 
 
 
 
$
2,119

 
$
(2,119
)