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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2024
Accounting Policies [Abstract]  
Schedule of Allowance for Uncollectible Accounts
Activity in the allowance for uncollectible accounts are as follows:
 Year Ended September 30
 202420232022
 (Thousands)
Balance at Beginning of Year$36,295 $40,228 $31,639 
Additions Charged to Costs and Expenses13,180 14,482 13,209 
Add: Discounts on Purchased Receivables753 1,380 1,314 
Deduct: Net Accounts Receivable Written-Off24,034 19,795 5,934 
Balance at End of Year$26,194 $36,295 $40,228 
Schedule of Depreciable Plant By Segment The following is a summary of depreciable plant by segment:
 As of September 30
 20242023
 (Thousands)
Exploration and Production$7,275,495 $6,741,095 
Pipeline and Storage2,919,506 2,803,690 
Gathering1,142,000 1,032,969 
Utility2,645,981 2,507,465 
All Other and Corporate15,915 15,787 
$13,998,897 $13,101,006 
Average Depreciation, Depletion and Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 Year Ended September 30
 202420232022
Exploration and Production, per Mcfe(1)$0.71 $0.65 $0.59 
Pipeline and Storage2.7 %2.6 %2.7 %
Gathering3.6 %3.6 %3.6 %
Utility2.8 %2.7 %2.7 %
All Other and Corporate3.0 %2.9 %1.4 %
(1)Amounts include depletion of exploration and production properties as well as depreciation of fixed assets. As disclosed in Note N — Supplementary Information for Exploration and Production Activities, depletion of exploration and production properties amounted to $0.69, $0.63 and $0.57 per Mcfe of production in 2024, 2023 and 2022, respectively.
Components of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Loss and changes for the years ended September 30, 2024 and 2023, net of related tax effects, are as follows (amounts in parentheses indicate debits) (in thousands):
 Gains and Losses on Derivative Financial InstrumentsFunded Status of the Pension and Other Post-Retirement Benefit PlansTotal
Year Ended September 30, 2024
Balance at October 1, 2023
$4,623 $(59,683)$(55,060)
Other Comprehensive Gains and Losses Before Reclassifications205,697 (13,515)192,182 
Amounts Reclassified From Other Comprehensive Loss(154,521)1,923 (152,598)
Balance at September 30, 2024
$55,799 $(71,275)$(15,476)
Year Ended September 30, 2023
Balance at October 1, 2022
$(572,163)$(53,570)$(625,733)
Other Comprehensive Gains and Losses Before Reclassifications493,936 (7,376)486,560 
Amounts Reclassified From Other Comprehensive Loss82,850 1,263 84,113 
Balance at September 30, 2023
$4,623 $(59,683)$(55,060)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
The details about the reclassification adjustments out of accumulated other comprehensive loss for the years ended September 30, 2024 and 2023 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
 for the
Year Ended
September 30,		Affected Line Item in the Statement Where Net Income is Presented
20242023
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts
$217,012 $(88,015)Operating Revenues
Foreign Currency Contracts
(357)(641)Operating Revenues
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
Prior Service Cost
(56)(82)(1)
Net Actuarial Loss
(2,451)(1,592)(1)
 214,148 (90,330)Total Before Income Tax
 (61,550)6,217 Income Tax Expense
 $152,598 $(84,113)Net of Tax
(1)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. Refer to Note K — Retirement Plan and Other Post-Retirement Benefits for additional details.
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):
 Year Ended September 30
 2024202320222021
Cash and Temporary Cash Investments$38,222 $55,447 $46,048 $31,528 
Hedging Collateral Deposits— — 91,670 88,610 
Cash, Cash Equivalents, and Restricted Cash$38,222 $55,447 $137,718 $120,138 
Schedule of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 Year Ended September 30
20242023
 (Thousands)
Prepayments$18,463 $18,966 
Prepaid Property and Other Taxes14,187 14,186 
Federal Income Taxes Receivable8,154 14,602 
State Income Taxes Receivable13,161 16,133 
Regulatory Assets38,264 36,373 
$92,229 $100,260 
Schedule of Other Accruals And Current Liabilities
The components of the Company’s Other Accruals and Current Liabilities are as follows:
 Year Ended September 30
 20242023
 (Thousands)
Accrued Capital Expenditures$47,344 $43,323 
Regulatory Liabilities29,352 38,105 
Liability for Royalty and Working Interests15,007 17,679 
Non-Qualified Benefit Plan Liability14,135 13,052 
Other57,065 48,815 
$162,903 $160,974