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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]  
Schedule of Allowance for Uncollectible Accounts
Activity in the allowance for uncollectible accounts are as follows:
 Year Ended September 30
 202520242023
 (Thousands)
Balance at Beginning of Year$26,194 $36,295 $40,228 
Additions Charged to Costs and Expenses19,195 13,180 14,482 
Add: Discounts on Purchased Receivables863 753 1,380 
Deduct: Net Accounts Receivable Written-Off29,153 24,034 19,795 
Balance at End of Year$17,099 $26,194 $36,295 
Schedule of Depreciable Plant By Segment The following is a summary of depreciable plant by segment:
 As of September 30
 20252024
 (Thousands)
Integrated Upstream and Gathering$9,151,025 $8,417,495 
Pipeline and Storage3,003,944 2,919,506 
Utility2,801,821 2,645,981 
All Other and Corporate16,650 15,915 
$14,973,440 $13,998,897 
Schedule of Average Depreciation, Depletion and Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 Year Ended September 30
 202520242023
Integrated Upstream and Gathering:
Exploration and Production Operations, per Mcfe(1)$0.61 $0.69 $0.63 
Integrated Upstream and Gathering Other Operations3.6 %3.6 %3.5 %
Pipeline and Storage2.6 %2.7 %2.6 %
Utility2.8 %2.8 %2.7 %
All Other and Corporate3.7 %3.0 %2.9 %
(1)Amounts represents depletion of exploration and production properties.
Schedule of Components of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Loss and changes for the years ended September 30, 2025 and 2024, 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, 2025
Balance at October 1, 2024
$55,799 $(71,275)$(15,476)
Other Comprehensive Gains and Losses Before Reclassifications(2,308)(11,148)(13,456)
Amounts Reclassified From Other Comprehensive Loss(33,541)3,251 (30,290)
Balance at September 30, 2025
$19,950 $(79,172)$(59,222)
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)
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, 2025 and 2024 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
20252024
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts
$46,957 $217,012 Operating Revenues
Foreign Currency Contracts
(1,066)(357)Operating Revenues
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
Prior Service Cost
(42)(56)(1)
Net Actuarial Loss
(4,210)(2,451)(1)
 41,639 214,148 Total Before Income Tax
 (11,349)(61,550)Income Tax Expense
 $30,290 $152,598 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
 2025202420232022
Cash and Temporary Cash Investments$43,166 $38,222 $55,447 $46,048 
Hedging Collateral Deposits— — — 91,670 
Cash, Cash Equivalents, and Restricted Cash$43,166 $38,222 $55,447 $137,718 
Schedule of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 Year Ended September 30
20252024
 (Thousands)
Prepayments$16,477 $18,463 
Prepaid Property and Other Taxes13,920 14,187 
Federal Income Taxes Receivable14,511 8,154 
State Income Taxes Receivable489 13,161 
Regulatory Assets35,362 38,264 
$80,759 $92,229 
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
 20252024
 (Thousands)
Accrued Capital Expenditures$45,932 $47,344 
Regulatory Liabilities20,624 29,352 
Liability for Royalty and Working Interests28,076 15,007 
Pennsylvania Impact Fee14,923 9,972 
Non-Qualified Benefit Plan Liability11,567 14,135 
Other53,567 47,093 
$174,689 $162,903