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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Schedule Of Depreciable Plant By Segment The following is a summary of depreciable plant by segment:
 
As of September 30
 
2019
 
2018
 
(Thousands)
Exploration and Production
$
5,747,731

 
$
5,222,037

Pipeline and Storage
2,191,166

 
2,110,714

Gathering
577,021

 
527,188

Utility
2,159,841

 
2,104,437

All Other and Corporate
112,857

 
112,295

 
$
10,788,616

 
$
10,076,671
Average Depreciation Depletion And Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 
Year Ended September 30
 
2019
 
2018
 
2017
Exploration and Production, per Mcfe(1)
$
0.73

 
$
0.70

 
$
0.65

Pipeline and Storage
2.2
%
 
2.2
%
 
2.2
%
Gathering
3.6
%
 
3.4
%
 
3.4
%
Utility
2.7
%
 
2.8
%
 
2.8
%
All Other and Corporate
1.8
%
 
2.4
%
 
1.5
%
 
(1)
Amounts include depletion of oil and gas producing properties as well as depreciation of fixed assets. As disclosed in Note M — Supplementary Information for Oil and Gas Producing Activities, depletion of oil and gas producing properties amounted to $0.71, $0.67 and $0.63 per Mcfe of production in 2019, 2018 and 2017, respectively.
Components Of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Income (Loss) and changes for the year ended September 30, 2019, 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, 2019
 
 
 
 
 
 
 
Balance at October 1, 2018
$
(28,611
)
 
$
7,437

 
$
(46,576
)
 
$
(67,750
)
Other Comprehensive Gains and Losses Before Reclassifications
58,682

 
—

 
(33,616
)
 
25,066

Amounts Reclassified From Other Comprehensive Income
2,738

 
—

 
5,634

 
8,372

Reclassification Adjustment for the Cumulative Effect of Adoption of Authoritative Guidance for Financial Assets and Liabilities
—

 
(7,437
)
 
—

 
(7,437
)
Reclassification of Stranded Tax Effects Related to the 2017 Tax Reform Act
1,866

 
—

 
(12,272
)
 
(10,406
)
Balance at September 30, 2019
$
34,675

 
$
—

 
$
(86,830
)
 
$
(52,155
)
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
)
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, 2019 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 is Presented
 
 
2019
 
2018
 
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
Commodity Contracts
 

($3,460
)
 

$423

 
Operating Revenues
Commodity Contracts
 
(1,182
)
 
952

 
Purchased Gas
Foreign Currency Contracts
 
(822
)
 
(2,564
)
 
Operating Revenues
Gains (Losses) on Securities Available for Sale
 
—

 
430

 
Other Income (Deductions)
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
 
 
 
 
 
 
Prior Service Cost
 
(264
)
 
(258
)
 
(1)
Net Actuarial Loss
 
(7,068
)
 
(9,446
)
 
(1)
 
 
(12,796
)
 
(10,463
)
 
Total Before Income Tax
 
 
4,424

 
1,324

 
Income Tax Expense
 
 

($8,372
)
 

($9,139
)
 
Net of Tax
 
(1)
These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost. Refer to Note I — Retirement Plan and Other Post-Retirement Benefits for additional details.
Schedule of Cash, Cash Equivalents and Restricted Cash
The components, as reported on the Company's Consolidated Balance Sheets, of the total cash, cash equivalents, and restricted cash presented on the Statement of Cash Flows are as follows (in thousands):
 
Year Ended September 30
 
2019
 
2018
 
2017
 
2016
 
 
Cash and Temporary Cash Investments
$
20,428

 
$
229,606

 
$
555,530

 
$
129,972

Hedging Collateral Deposits
6,832

 
3,441

 
1,741

 
1,484

Cash, Cash Equivalents, and Restricted Cash
$
27,260

 
$
233,047

 
$
557,271

 
$
131,456
Schedule Of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 
Year Ended September 30
 
2019
 
2018
 
(Thousands)
Prepayments
$
12,728

 
$
11,126

Prepaid Property and Other Taxes
14,361

 
14,088

Federal Income Taxes Receivable
42,388

 
22,457

State Income Taxes Receivable
8,579

 
8,822

Fair Values of Firm Commitments
7,538

 
1,739

Regulatory Assets
11,460

 
9,792

 
$
97,054

 
$
68,024
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
 
2019
 
2018
 
(Thousands)
Accrued Capital Expenditures
$
33,713

 
$
38,354

Regulatory Liabilities
50,332

 
57,425

Liability for Royalty and Working Interests
18,057

 
12,062

Non-Qualified Benefit Plan Liability
13,194

 
11,536

Other
24,304

 
13,316

 
$
139,600

 
$
132,693