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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Components Of Accumulated Other Comprehensive Loss
The components of Accumulated Other Comprehensive Loss and changes for the quarter and nine months ended June 30, 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 June 30, 2018
 
 
 
 
 
 
 
Balance at April 1, 2018
$
3,841

 
$
6,885

 
$
(58,486
)
 
$
(47,760
)
Other Comprehensive Gains and Losses Before Reclassifications
(27,036
)
 
(163
)
 
—

 
(27,199
)
Amounts Reclassified From Other Comprehensive Income (Loss)
2,563

 
—

 
—

 
2,563

Balance at June 30, 2018
$
(20,632
)
 
$
6,722

 
$
(58,486
)
 
$
(72,396
)
Nine Months Ended June 30, 2018
 
 
 
 
 
 
 
Balance at October 1, 2017
$
20,801

 
$
7,562

 
$
(58,486
)
 
$
(30,123
)
Other Comprehensive Gains and Losses Before Reclassifications
(39,294
)
 
(568
)
 
—

 
(39,862
)
Amounts Reclassified From Other Comprehensive Income (Loss)
(2,139
)
 
(272
)
 
—

 
(2,411
)
Balance at June 30, 2018
$
(20,632
)
 
$
6,722

 
$
(58,486
)
 
$
(72,396
)
Three Months Ended June 30, 2017
 
 
 
 
 
 
 
Balance at April 1, 2017
$
36,257

 
$
6,128

 
$
(76,476
)
 
$
(34,091
)
Other Comprehensive Gains and Losses Before Reclassifications
10,641

 
905

 
—

 
11,546

Amounts Reclassified From Other Comprehensive Income (Loss)
(10,759
)
 
—

 
—

 
(10,759
)
Balance at June 30, 2017
$
36,139

 
$
7,033

 
$
(76,476
)
 
$
(33,304
)
Nine Months Ended June 30, 2017
 
 
 
 
 
 
 
Balance at October 1, 2016
$
64,782

 
$
6,054

 
$
(76,476
)
 
$
(5,640
)
Other Comprehensive Gains and Losses Before Reclassifications
5,937

 
1,448

 
—

 
7,385

Amounts Reclassified From Other Comprehensive Income (Loss)
(34,580
)
 
(469
)
 
—

 
(35,049
)
Balance at June 30, 2017
$
36,139

 
$
7,033

 
$
(76,476
)
 
$
(33,304
)
 
 
 
 
 
 
 
 
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 nine months ended June 30, 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 June 30,
 
Nine Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
     Commodity Contracts
 

($3,249
)
 

$18,600

 

$6,125

 

$62,030

 
Operating Revenues
     Commodity Contracts
 
5

 
21

 
952

 
(1,938
)
 
Purchased Gas
     Foreign Currency Contracts
 
(527
)
 
(169
)
 
(1,500
)
 
(451
)
 
Operation and Maintenance Expense
Gains (Losses) on Securities Available for Sale
 
—

 
—

 
430

 
741

 
Other Income
 
 
(3,771
)
 
18,452

 
6,007

 
60,382

 
Total Before Income Tax
 
 
1,208

 
(7,693
)
 
(3,596
)
 
(25,333
)
 
Income Tax Expense
 
 

($2,563
)
 

$10,759

 

$2,411

 

$35,049

 
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, 2018
 
At September 30, 2017
 
 
 
 
Prepayments
$
10,594

 
$
10,927

Prepaid Property and Other Taxes
11,177

 
13,974

Federal Income Taxes Receivable
17,216

 
—

State Income Taxes Receivable
5,065

 
9,689

Fair Values of Firm Commitments
1,350

 
1,031

Regulatory Assets
7,288

 
15,884

 
$
52,690

 
$
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 June 30, 2018
 
At September 30, 2017
 
 
 
 
Accrued Capital Expenditures
$
53,534

 
$
37,382

Regulatory Liabilities
43,167

 
34,059

Reserve for Gas Replacement
14,651

 
—

Federal Income Taxes Payable
—

 
1,775

2017 Tax Reform Act Regulatory Refund
11,817

 
—

Other
38,083

 
38,673

 
$
161,252

 
$
111,889