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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
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, 2015 and 2014, 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, 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

Three Months Ended June 30, 2014
 
 
 
 
Balance at April 1, 2014
$
2,937

$
8,301

$
(56,293
)
$
(45,055
)
Other Comprehensive Gains and Losses Before Reclassifications
(5,565
)
771

—

(4,794
)
Amounts Reclassified From Other Comprehensive Income (Loss)
6,202

9

—

6,211

Balance at June 30, 2014
$
3,574

$
9,081

$
(56,293
)
$
(43,638
)
Nine Months Ended June 30, 2014
 
 
 
 
Balance at October 1, 2013
$
30,722

$
6,337

$
(56,293
)
$
(19,234
)
Other Comprehensive Gains and Losses Before Reclassifications
(42,935
)
2,735

—

(40,200
)
Amounts Reclassified From Other Comprehensive Income (Loss)
15,787

9

—

15,796

Balance at June 30, 2014
$
3,574

$
9,081

$
(56,293
)
$
(43,638
)
 
 
 
 
 
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, 2015 and 2014 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)
Affected Line Item in the Statement Where Net Income (Loss) is Presented
 
Three Months Ended June 30,
Nine Months Ended June 30,
 
 
2015
2014
2015
2014
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
     Commodity Contracts

$50,878


($14,547
)

$124,386


($27,372
)
Operating Revenues
     Commodity Contracts
(3
)
83

4,884

(3,549
)
Purchased Gas
Gains (Losses) on Securities Available for Sale
—

(16
)
—

(16
)
Other Income
 
50,875

(14,480
)
129,270

(30,937
)
Total Before Income Tax
 
(21,800
)
8,269

(54,807
)
15,141

Income Tax Expense
 

$29,075


($6,211
)

$74,463


($15,796
)
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, 2015
 
At September 30, 2014
 
 
 
 
Prepayments
$
11,173

 
$
10,079

Prepaid Property and Other Taxes
11,061

 
13,743

Federal Income Taxes Receivable
—

 
8,211

Fair Values of Firm Commitments
11,078

 
—

Regulatory Assets
16,137

 
22,719

 
$
49,449

 
$
54,752
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, 2015
 
At September 30, 2014
 
 
 
 
Accrued Capital Expenditures
$
76,242

 
$
80,348

Regulatory Liabilities
5,556

 
18,072

Reserve for Gas Replacement
32,908

 
—

Federal Income Taxes Payable
13,766

 
—

State Income Taxes Payable
1,763

 
5,798

Other
27,494

 
32,454

 
$
157,729

 
$
136,672