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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Cash, Cash Equivalents and Restricted Cash The components, as reported on the Company’s Consolidated Balance Sheets, of the total cash, cash equivalents, and restricted cash presented on the Statement of Cash Flows are as follows (in thousands):
 
Six Months Ended
March 31, 2020
 
Six Months Ended
March 31, 2019
 
Balance at October 1, 2019
 
Balance at March 31, 2020
 
Balance at October 1, 2018
 
Balance at March 31, 2019
 
 
 
 
 
 
 
 
Cash and Temporary Cash Investments
$
20,428

 
$
111,655

 
$
229,606

 
$
100,643

Hedging Collateral Deposits
6,832

 
10,728

 
3,441

 
1,983

Cash, Cash Equivalents, and Restricted Cash
$
27,260

 
$
122,383

 
$
233,047

 
$
102,626
Components of Accumulated Other Comprehensive Loss The components of Accumulated Other Comprehensive Loss and changes for the six months ended March 31, 2020 and 2019, 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, 2020
 
 
 
 
 
 
 
Balance at January 1, 2020
$
30,680

 
$
—

 
$
(86,830
)
 
$
(56,150
)
Other Comprehensive Gains and Losses Before Reclassifications
55,450

 
—

 
—

 
55,450

Amounts Reclassified From Other Comprehensive Income (Loss)
(18,217
)
 
—

 
—

 
(18,217
)
Balance at March 31, 2020
$
67,913

 
$
—

 
$
(86,830
)
 
$
(18,917
)
Six Months Ended March 31, 2020
 
 
 
 
 
 
 
Balance at October 1, 2019
$
34,675

 
$
—

 
$
(86,830
)
 
$
(52,155
)
Other Comprehensive Gains and Losses Before Reclassifications
55,825

 
—

 
—

 
55,825

Amounts Reclassified From Other Comprehensive Income (Loss)
(23,537
)
 
—

 
—

 
(23,537
)
Cumulative Effect of Adoption of Authoritative Guidance for Hedging
950

 
—

 
—

 
950

Balance at March 31, 2020
$
67,913

 
$
—

 
$
(86,830
)
 
$
(18,917
)
Three Months Ended March 31, 2019
 
 
 
 
 
 
 
Balance at January 1, 2019
$
17,886

 
$
—

 
$
(46,576
)
 
$
(28,690
)
Other Comprehensive Gains and Losses Before Reclassifications
(18,601
)
 
—

 
—

 
(18,601
)
Amounts Reclassified From Other Comprehensive Income (Loss)
3,411

 
—

 
—

 
3,411

Reclassification of Stranded Tax Effects Related to the 2017 Tax Reform Act
1,866

 
—

 
(12,272
)
 
(10,406
)
Balance at March 31, 2019
$
4,562

 
$
—

 
$
(58,848
)
 
$
(54,286
)
Six Months Ended March 31, 2019
 
 
 
 
 
 
 
Balance at October 1, 2018
$
(28,611
)
 
$
7,437

 
$
(46,576
)
 
$
(67,750
)
Other Comprehensive Gains and Losses Before Reclassifications
13,797

 
—

 
—

 
13,797

Amounts Reclassified From Other Comprehensive Income (Loss)
17,510

 
—

 
—

 
17,510

Reclassification Adjustment for the Cumulative Effect of Adoption of Authoritative Guidance for Financial Assets and Liabilities
—

 
(7,437
)
 
—

 
(7,437
)
Reclassification of Stranded Tax Effects Related to the 2017 Tax Reform Act
1,866

 
—

 
(12,272
)
 
(10,406
)
Balance at March 31, 2019
$
4,562

 
$
—

 
$
(58,848
)
 
$
(54,286
)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss The details about the reclassification adjustments out of accumulated other comprehensive loss for the six months ended March 31, 2020 and 2019 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,
 
 
2020
 
2019
 
2020
 
2019
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
     Commodity Contracts
 

$23,396

 

($4,260
)
 

$30,937

 

($22,782
)
 
Operating Revenues
     Commodity Contracts
 
1,909

 
(280
)
 
1,911

 
(1,182
)
 
Purchased Gas
     Foreign Currency Contracts
 
(271
)
 
(199
)
 
(462
)
 
(420
)
 
Operating Revenues
 
 
25,034

 
(4,739
)
 
32,386

 
(24,384
)
 
Total Before Income Tax
 
 
(6,817
)
 
1,328

 
(8,849
)
 
6,874

 
Income Tax Expense
 
 

$18,217

 

($3,411
)
 

$23,537

 

($17,510
)
 
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, 2020
 
At September 30, 2019
 
 
 
 
Prepayments
$
6,289

 
$
12,728

Prepaid Property and Other Taxes
23,702

 
14,361

Federal Income Taxes Receivable
42,385

 
42,388

State Income Taxes Receivable
3,455

 
8,579

Fair Values of Firm Commitments
8,775

 
7,538

Regulatory Assets
15,582

 
11,460

 
$
100,188

 
$
97,054
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, 2020
 
At September 30, 2019
 
 
 
 
Accrued Capital Expenditures
$
31,886

 
$
33,713

Regulatory Liabilities
45,338

 
50,332

Reserve for Gas Replacement
23,978

 
—

Liability for Royalty and Working Interests
13,987

 
18,057

Non-Qualified Benefit Plan Liability
13,194

 
13,194

Other
21,856

 
24,304

 
$
150,239

 
$
139,600