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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]  
Schedule of Change in Asset Retirement Obligation
The table below is a reconciliation of the asset retirement obligation from September 30, 2015 to June 30, 2016 (in thousands):
 
Nine Months Ended 
 June 30, 2016
 
 
Balance at Beginning of Year
$
156,805

Liabilities Incurred
—

Revisions of Estimates
17,845

Liabilities Settled
(66,756
)
Accretion Expense
6,910

Balance at June 30, 2016
$
114,804
Components Of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Income (Loss) and changes for the quarter and nine months ended June 30, 2016 and 2015, 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
Three Months Ended June 30, 2016
 
 
 
 
Balance at April 1, 2016
$
146,671

$
5,309

$
(69,794
)
$
82,186

Other Comprehensive Gains and Losses Before Reclassifications
(40,842
)
254

—

(40,588
)
Amounts Reclassified From Other Comprehensive Income (Loss)
(33,859
)
—

—

(33,859
)
Balance at June 30, 2016
$
71,970

$
5,563

$
(69,794
)
$
7,739

Nine Months Ended June 30, 2016
 
 
 
 
Balance at October 1, 2015
$
157,197

$
5,969

$
(69,794
)
$
93,372

Other Comprehensive Gains and Losses Before Reclassifications
23,432

(181
)
—

23,251

Amounts Reclassified From Other Comprehensive Income (Loss)
(108,659
)
(225
)
—

(108,884
)
Balance at June 30, 2016
$
71,970

$
5,563

$
(69,794
)
$
7,739

Three Months Ended June 30, 2015
 
 
 
 
Balance at April 1, 2015
$
174,413

$
8,296

$
(56,020
)
$
126,689

Other Comprehensive Gains and Losses Before Reclassifications
(5,423
)
57

—

(5,366
)
Amounts Reclassified From Other Comprehensive Income (Loss)
(29,075
)
—

—

(29,075
)
Balance at June 30, 2015
$
139,915

$
8,353

$
(56,020
)
$
92,248

Nine Months Ended June 30, 2015
 
 
 
 
Balance at October 1, 2014
$
43,659

$
8,382

$
(56,020
)
$
(3,979
)
Other Comprehensive Gains and Losses Before Reclassifications
170,719

(29
)
—

170,690

Amounts Reclassified From Other Comprehensive Income (Loss)
(74,463
)
—

—

(74,463
)
Balance at June 30, 2015
$
139,915

$
8,353

$
(56,020
)
$
92,248

 
 
 
 
 
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 quarter and nine months ended June 30, 2016 and 2015 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
Affected Line Item in the Statement Where Net Income (Loss) is Presented
 
Three Months Ended June 30,
Nine Months Ended June 30,
 
 
2016
2015
2016
2015
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
     Commodity Contracts

$58,354


$50,878


$172,596


$124,386

Operating Revenues
     Commodity Contracts
70

(3
)
4,520

4,884

Purchased Gas
     Foreign Currency Contracts
(51
)
—

(337
)
—

Operation and Maintenance Expense
Gains (Losses) on Securities Available for Sale
—

—

388

—

Other Income
 
58,373

50,875

177,167

129,270

Total Before Income Tax
 
(24,514
)
(21,800
)
(68,283
)
(54,807
)
Income Tax Expense
 

$33,859


$29,075


$108,884


$74,463

Net of Tax
Schedule Of Other Current Assets
The components of the Company’s Other Current Assets are as follows (in thousands):
                            
At June 30, 2016
 
At September 30, 2015
 
 
 
 
Prepayments
$
11,963

 
$
10,743

Prepaid Property and Other Taxes
10,574

 
13,709

Federal Income Taxes Receivable
5,830

 
—

State Income Taxes Receivable
2,237

 
—

Fair Values of Firm Commitments
3,227

 
15,775

Regulatory Assets
13,287

 
20,438

 
$
47,118

 
$
60,665
Schedule Of Other Accruals And Current Liabilities
The components of the Company’s Other Accruals and Current Liabilities are as follows (in thousands):
                            
At June 30, 2016
 
At September 30, 2015
 
 
 
 
Accrued Capital Expenditures
$
19,287

 
$
53,652

Regulatory Liabilities
22,138

 
5,346

Reserve for Gas Replacement
6,490

 
—

Federal Income Taxes Payable
—

 
5,686

State Income Taxes Payable
—

 
1,170

Other
24,844

 
30,703

 
$
72,759

 
$
96,557