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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2019
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, 2019
 
Six Months Ended 
 March 31, 2018
 
Balance at October 1, 2018
 
Balance at March 31, 2019
 
Balance at October 1, 2017
 
Balance at March 31, 2018
 
 
 
 
 
 
 
 
Cash and Temporary Cash Investments
$
229,606

 
$
100,643

 
$
555,530

 
$
227,994

Hedging Collateral Deposits
3,441

 
1,983

 
1,741

 
3,657

Cash, Cash Equivalents, and Restricted Cash
$
233,047

 
$
102,626

 
$
557,271

 
$
231,651
Components of Accumulated Other Comprehensive Loss The components of Accumulated Other Comprehensive Loss and changes for the six months ended March 31, 2019 and 2018, 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, 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
)
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
)
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, 2019 and 2018 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,
 
 
2019
 
2018
 
2019
 
2018
 
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
 
 
 
 
 
 
 
 
 
     Commodity Contracts
 

($4,260
)
 

($3,467
)
 

($22,782
)
 

$9,375

 
Operating Revenues
     Commodity Contracts
 
(280
)
 
750

 
(1,182
)
 
947

 
Purchased Gas
     Foreign Currency Contracts
 
(199
)
 
(482
)
 
(420
)
 
(973
)
 
Operating Revenues
Gains (Losses) on Securities Available for Sale
 
—

 
—

 
—

 
430

 
Other Income (Deductions)
 
 
(4,739
)
 
(3,199
)
 
(24,384
)
 
9,779

 
Total Before Income Tax
 
 
1,328

 
551

 
6,874

 
(4,804
)
 
Income Tax Expense
 
 

($3,411
)
 

($2,648
)
 

($17,510
)
 

$4,975

 
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, 2019
 
At September 30, 2018
 
 
 
 
Prepayments
$
8,063

 
$
11,126

Prepaid Property and Other Taxes
23,015

 
14,088

Federal Income Taxes Receivable
7,460

 
22,457

State Income Taxes Receivable
7,677

 
8,822

Fair Values of Firm Commitments
179

 
1,739

Regulatory Assets
11,192

 
9,792

 
$
57,586

 
$
68,024
Schedule of Other Assets The components of the Company’s Other Assets are as follows (in thousands):
                            
At March 31, 2019
 
At September 30, 2018
 
 
 
 
Federal Income Taxes Receivable
$
42,093

 
$
—

Other
91

 
102

 
$
42,184

 
$
102
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, 2019
 
At September 30, 2018
 
 
 
 
Accrued Capital Expenditures
$
52,875

 
$
38,354

Regulatory Liabilities
53,744

 
57,425

Reserve for Gas Replacement
36,922

 
—

Liability for Royalty and Working Interests
21,438

 
12,062

Other
30,818

 
24,852

 
$
195,797

 
$
132,693