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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Components Of Accumulated Other Comprehensive Loss
The components of Accumulated Other Comprehensive Loss and changes for the quarter and six months ended March 31, 2018 and 2017, 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 March 31, 2018
 
 
 
 
Balance at January 1, 2018
$
10,256

$
7,311

$
(58,486
)
$
(40,919
)
Other Comprehensive Gains and Losses Before Reclassifications
(9,063
)
(426
)
—

(9,489
)
Amounts Reclassified From Other Comprehensive Income (Loss)
2,648

—

—

2,648

Balance at March 31, 2018
$
3,841

$
6,885

$
(58,486
)
$
(47,760
)
Six Months Ended March 31, 2018
 
 
 
 
Balance at October 1, 2017
$
20,801

$
7,562

$
(58,486
)
$
(30,123
)
Other Comprehensive Gains and Losses Before Reclassifications
(12,257
)
(405
)
—

(12,662
)
Amounts Reclassified From Other Comprehensive Income (Loss)
(4,703
)
(272
)
—

(4,975
)
Balance at March 31, 2018
$
3,841

$
6,885

$
(58,486
)
$
(47,760
)
Three Months Ended March 31, 2017
 
 
 
 
Balance at January 1, 2017
$
16,570

$
5,047

$
(76,476
)
$
(54,859
)
Other Comprehensive Gains and Losses Before Reclassifications
25,745

1,081

—

26,826

Amounts Reclassified From Other Comprehensive Income (Loss)
(6,058
)
—

—

(6,058
)
Balance at March 31, 2017
$
36,257

$
6,128

$
(76,476
)
$
(34,091
)
Six Months Ended March 31, 2017
 
 
 
 
Balance at October 1, 2016
$
64,782

$
6,054

$
(76,476
)
$
(5,640
)
Other Comprehensive Gains and Losses Before Reclassifications
(4,705
)
543

—

(4,162
)
Amounts Reclassified From Other Comprehensive Income (Loss)
(23,820
)
(469
)
—

(24,289
)
Balance at March 31, 2017
$
36,257

$
6,128

$
(76,476
)
$
(34,091
)
 
 
 
 
 
Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Loss
The details about the reclassification adjustments out of accumulated other comprehensive loss for the quarter and six months ended March 31, 2018 and 2017 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other Comprehensive Loss Components
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Loss
Affected Line Item in the Statement Where Net Income is Presented
 
Three Months Ended March 31,
Six Months Ended March 31,
 
 
2018
2017
2018
2017
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
     Commodity Contracts

($3,467
)

$12,109


$9,375


$43,429

Operating Revenues
     Commodity Contracts
750

(1,498
)
947

(1,958
)
Purchased Gas
     Foreign Currency Contracts
(482
)
(139
)
(973
)
(282
)
Operation and Maintenance Expense
Gains (Losses) on Securities Available for Sale
—

—

430

741

Other Income
 
(3,199
)
10,472

9,779

41,930

Total Before Income Tax
 
551

(4,414
)
(4,804
)
(17,641
)
Income Tax Expense
 

($2,648
)

$6,058


$4,975


$24,289

Net of Tax
Schedule Of Other Current Assets
The components of the Company’s Other Current Assets are as follows (in thousands):
                            
At March 31, 2018
 
At September 30, 2017
 
 
 
 
Prepayments
$
6,208

 
$
10,927

Prepaid Property and Other Taxes
22,482

 
13,974

Federal Income Taxes Receivable
17,282

 
—

State Income Taxes Receivable
2,371

 
9,689

Fair Values of Firm Commitments
1,608

 
1,031

Regulatory Assets
10,373

 
15,884

 
$
60,324

 
$
51,505
Schedule Of Other Accruals And Current Liabilities
The components of the Company’s Other Accruals and Current Liabilities are as follows (in thousands):
                            
At March 31, 2018
 
At September 30, 2017
 
 
 
 
Accrued Capital Expenditures
$
26,800

 
$
37,382

Regulatory Liabilities
41,409

 
34,059

Reserve for Gas Replacement
34,332

 
—

Federal Income Taxes Payable
—

 
1,775

2017 Tax Reform Act Regulatory Refund
11,336

 
—

Other
33,672

 
38,673

 
$
147,549

 
$
111,889