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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]  
Schedule Of Depreciable Plant By Segment
The following is a summary of depreciable plant by segment:
 
As of September 30
 
2016
 
2015
 
(Thousands)
Exploration and Production
$
4,645,226

 
$
4,556,096

Pipeline and Storage
1,956,708

 
1,710,947

Gathering
454,343

 
307,274

Utility
1,998,605

 
1,888,489

Energy Marketing
3,528

 
3,494

All Other and Corporate
109,455

 
109,193

 
$
9,167,865

 
$
8,575,493
Average Depreciation Depletion And Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 
Year Ended September 30
 
2016
 
2015
 
2014
Exploration and Production, per Mcfe(1)
$
0.87

 
$
1.52

 
$
1.85

Pipeline and Storage
2.4
%
 
2.4
%
 
2.4
%
Gathering
4.0
%
 
4.0
%
 
3.3
%
Utility
2.7
%
 
2.6
%
 
2.6
%
Energy Marketing
7.9
%
 
6.1
%
 
5.8
%
All Other and Corporate
1.8
%
 
1.4
%
 
0.9
%
 
(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 $0.85, $1.49 and $1.82 per Mcfe of production in 2016, 2015 and 2014, respectively.
Components Of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Income (Loss) and changes for the year ended September 30, 2016, 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, 2016
 
 
 
 
 
 
 
Balance at October 1, 2015
$
157,197

 
$
5,969

 
$
(69,794
)
 
$
93,372

Other Comprehensive Gains and Losses Before Reclassifications
41,845

 
932

 
(13,027
)
 
29,750

Amounts Reclassified From Other Comprehensive Loss
(134,260
)
 
(847
)
 
6,345

 
(128,762
)
Balance at September 30, 2016
$
64,782

 
$
6,054

 
$
(76,476
)
 
$
(5,640
)
 
 
 
 
 
 
 
 
Year Ended September 30, 2015
 
 
 
 
 
 
 
Balance at October 1, 2014
$
43,659

 
$
8,382

 
$
(56,020
)
 
$
(3,979
)
Other Comprehensive Gains and Losses Before Reclassifications
220,146

 
(2,039
)
 
(19,616
)
 
198,491

Amounts Reclassified From Other Comprehensive Income
(106,608
)
 
(374
)
 
5,842

 
(101,140
)
Balance at September 30, 2015
$
157,197

 
$
5,969

 
$
(69,794
)
 
$
93,372
Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)
The details about the reclassification adjustments out of accumulated other comprehensive income (loss) for the year ended September 30, 2016 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
 
 
2016
 
2015
 
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
Commodity Contracts
 

$216,823

 

$180,069

 
Operating Revenues
Commodity Contracts
 
4,520

 
4,884

 
Purchased Gas
Foreign Currency Contracts
 
(424
)
 
—

 
Operation and Maintenance Expense
Gains (Losses) on Securities Available for Sale
 
1,374

 
591

 
Other Income
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
 
 
 
 
 
 
Prior Service Credit
 
(333
)
 
109

 
(1)
Net Actuarial Loss
 
(9,735
)
 
(9,326
)
 
(1)
 
 
212,225

 
176,327

 
Total Before Income Tax
 
 
(83,463
)
 
(75,187
)
 
Income Tax Expense
 
 

$128,762

 

$101,140

 
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
 
2016
 
2015
 
(Thousands)
Prepayments
$
10,919

 
$
10,743

Prepaid Property and Other Taxes
13,138

 
13,709

Federal Income Taxes Receivable
11,758

 
—

State Income Taxes Receivable
3,961

 
—

Fair Values of Firm Commitments
3,962

 
15,775

Regulatory Assets
15,616

 
20,438

 
$
59,354

 
$
60,665
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
 
2016
 
2015
 
(Thousands)
Accrued Capital Expenditures
$
26,796

 
$
53,652

Regulatory Liabilities
14,725

 
5,346

Federal Income Taxes Payable
—

 
5,686

State Income Taxes Payable
—

 
1,170

Other
32,909

 
30,703

 
$
74,430

 
$
96,557