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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule Of Depreciable Plant By Segment
The following is a summary of depreciable plant by segment:
 
As of September 30
 
2018
 
2017
 
(Thousands)
Exploration and Production
$
5,222,037

 
$
4,925,409

Pipeline and Storage
2,110,714

 
2,002,736

Gathering
527,188

 
484,768

Utility
2,104,437

 
2,045,074

Energy Marketing
3,604

 
3,564

All Other and Corporate
108,691

 
109,128

 
$
10,076,671

 
$
9,570,679
Average Depreciation Depletion And Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 
Year Ended September 30
 
2018
 
2017
 
2016
Exploration and Production, per Mcfe(1)
$
0.70

 
$
0.65

 
$
0.87

Pipeline and Storage
2.2
%
 
2.2
%
 
2.4
%
Gathering
3.4
%
 
3.4
%
 
4.0
%
Utility
2.8
%
 
2.8
%
 
2.7
%
Energy Marketing
7.7
%
 
7.9
%
 
7.9
%
All Other and Corporate
2.2
%
 
1.3
%
 
1.8
%
 
(1)
Amounts include depletion of oil and gas producing properties as well as depreciation of fixed assets. As disclosed in Note L — Supplementary Information for Oil and Gas Producing Activities, depletion of oil and gas producing properties amounted to $0.67, $0.63 and $0.85 per Mcfe of production in 2018, 2017 and 2016, respectively.
Components Of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Income (Loss) and changes for the year ended September 30, 2018, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands):
 
Gains and Losses on Derivative Financial Instruments
 
Gains and Losses on Securities Available for Sale
 
Funded Status of the Pension and Other Post-Retirement Benefit Plans
 
Total
Year Ended September 30, 2018
 
 
 
 
 
 
 
Balance at October 1, 2017
$
20,801

 
$
7,562

 
$
(58,486
)
 
$
(30,123
)
Other Comprehensive Gains and Losses Before Reclassifications
(51,556
)
 
147

 
4,643

 
(46,766
)
Amounts Reclassified From Other Comprehensive Loss
2,144

 
(272
)
 
7,267

 
9,139

Balance at September 30, 2018
$
(28,611
)
 
$
7,437

 
$
(46,576
)
 
$
(67,750
)
Year Ended September 30, 2017
 
 
 
 
 
 
 
Balance at October 1, 2016
$
64,782

 
$
6,054

 
$
(76,476
)
 
$
(5,640
)
Other Comprehensive Gains and Losses Before Reclassifications
3,338

 
2,503

 
9,486

 
15,327

Amounts Reclassified From Other Comprehensive Loss
(47,319
)
 
(995
)
 
8,504

 
(39,810
)
Balance at September 30, 2017
$
20,801

 
$
7,562

 
$
(58,486
)
 
$
(30,123
)
Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)
The details about the reclassification adjustments out of accumulated other comprehensive loss for the year ended September 30, 2018 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other
Comprehensive Income (Loss) Components
 
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) for the
Year Ended
September 30,
 
Affected Line Item in the Statement Where Net Income (Loss) is Presented
 
 
2018
 
2017
 
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
Commodity Contracts
 

$423

 

$83,983

 
Operating Revenues
Commodity Contracts
 
952

 
(1,921
)
 
Purchased Gas
Foreign Currency Contracts
 
(2,564
)
 
(457
)
 
Operation and Maintenance Expense
Gains (Losses) on Securities Available for Sale
 
430

 
1,575

 
Other Income
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
 
 
 
 
 
 
Prior Service Credit
 
(258
)
 
(288
)
 
(1)
Net Actuarial Loss
 
(9,446
)
 
(13,145
)
 
(1)
 
 
(10,463
)
 
69,747

 
Total Before Income Tax
 
 
1,324

 
(29,937
)
 
Income Tax Expense
 
 

($9,139
)
 

$39,810

 
Net of Tax
 
(1)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost. Refer to Note H — Retirement Plan and Other Post-Retirement Benefits for additional details.
Schedule Of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 
Year Ended September 30
 
2018
 
2017
 
(Thousands)
Prepayments
$
11,126

 
$
10,927

Prepaid Property and Other Taxes
14,088

 
13,974

Federal Income Taxes Receivable
22,457

 
—

State Income Taxes Receivable
8,822

 
9,689

Fair Values of Firm Commitments
1,739

 
1,031

Regulatory Assets
9,792

 
15,884

 
$
68,024

 
$
51,505
Schedule of Other Accruals And Current Liabilities
The components of the Company’s Other Accruals and Current Liabilities are as follows:
 
Year Ended September 30
 
2018
 
2017
 
(Thousands)
Accrued Capital Expenditures
$
38,354

 
$
37,382

Regulatory Liabilities
57,425

 
34,059

Federal Income Taxes Payable
—

 
1,775

Other
36,914

 
38,673

 
$
132,693

 
$
111,889