v3.26.1
Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2026
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, 2026		Six Months Ended
 March 31, 2025
 Balance at
March 31, 2026		Balance at October 1, 2025Balance at
March 31, 2025		Balance at October 1, 2024
Cash and Temporary Cash Investments$26,596 $43,166 $39,954 $38,222 
Cash Held in Trust for Bondholders— — 51,352 — 
Cash, Cash Equivalents, and Restricted Cash$26,596 $43,166 $91,306 $38,222 
Schedule of Allowance for Uncollectible Accounts Activity in the allowance for uncollectible accounts for the six months ended March 31, 2026 and 2025 are as follows (in thousands):
Balance at Beginning of PeriodAdditions Charged to Costs and ExpensesDiscounts on Purchased ReceivablesNet Accounts Receivable Written-OffBalance at End of Period
Six Months Ended March 31, 2026
Allowance for Uncollectible Accounts$17,099 $12,678 $627 $(6,387)$24,017 
Six Months Ended March 31, 2025
Allowance for Uncollectible Accounts$26,194 $15,497 $535 $(18,775)$23,451 
Schedule of Components of Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) and changes for the six months ended March 31, 2026 and 2025, net of related tax effect, 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
Three Months Ended March 31, 2026
Balance at January 1, 2026$46,182 $(79,172)$(32,990)
Other Comprehensive Gains and Losses Before Reclassifications
(1,604)— (1,604)
Amounts Reclassified From Other Comprehensive Loss35,705 — 35,705 
Balance at March 31, 2026$80,283 $(79,172)$1,111 
Six Months Ended March 31, 2026
Balance at October 1, 2025$19,950 $(79,172)$(59,222)
Other Comprehensive Gains and Losses Before Reclassifications
34,349 — 34,349 
Amounts Reclassified From Other Comprehensive Loss25,984 — 25,984 
Balance at March 31, 2026$80,283 $(79,172)$1,111 
Three Months Ended March 31, 2025
Balance at January 1, 2025$(4,878)$(71,275)$(76,153)
Other Comprehensive Gains and Losses Before Reclassifications
(152,786)— (152,786)
Amounts Reclassified From Other Comprehensive Loss5,964 — 5,964 
Balance at March 31, 2025$(151,700)$(71,275)$(222,975)
Six Months Ended March 31, 2025
Balance at October 1, 2024$55,799 $(71,275)$(15,476)
Other Comprehensive Gains and Losses Before Reclassifications
(191,899)— (191,899)
Amounts Reclassified From Other Comprehensive Loss(15,600)— (15,600)
Balance at March 31, 2025$(151,700)$(71,275)$(222,975)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) The details about the reclassification adjustments out of accumulated other comprehensive income (loss) for the six months ended March 31, 2026 and 2025 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other Comprehensive Income (Loss) ComponentsAmount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)Affected Line Item in the Statement Where Net Income is Presented
Three Months Ended
March 31,		Six Months Ended
 March 31,
2026202520262025
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
     Commodity Contracts($48,694)($7,834)($35,299)$21,894 Operating Revenues
     Foreign Currency Contracts(66)(326)(186)(550)Operating Revenues
 (48,760)(8,160)(35,485)21,344 Total Before Income Tax
 13,055 2,196 9,501 (5,744)Income Tax Expense
 ($35,705)($5,964)($25,984)$15,600 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, 2026At September 30, 2025
Prepayments$8,699 $16,477 
Prepaid Property and Other Taxes22,207 13,920 
Federal Income Taxes Receivable— 14,511 
State Income Taxes Receivable— 489 
Regulatory Assets33,037 35,362 
 $63,943 $80,759 
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, 2026At September 30, 2025
Accrued Capital Expenditures$57,675 $45,932 
Regulatory Liabilities20,235 20,624 
Reserve for Gas Replacement47,387 — 
Liability for Royalty and Working Interests44,108 28,076 
Federal Income Taxes Payable7,029 — 
State Income Taxes Payable4,997 — 
Pennsylvania Impact Fee3,680 14,923 
Non-Qualified Benefit Plan Liability11,567 11,567 
Other46,082 53,567 
 $242,760 $174,689