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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Mar. 31, 2025
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, 2025		Six Months Ended
 March 31, 2024
 Balance at
March 31, 2025		Balance at October 1, 2024Balance at
March 31, 2024		Balance at October 1, 2023
Cash and Temporary Cash Investments$39,954 $38,222 $50,769 $55,447 
Cash Held in Trust for Bondholders51,352 — — — 
Cash, Cash Equivalents, and Restricted Cash$91,306 $38,222 $50,769 $55,447 
Schedule of Allowance for Uncollectible Accounts Activity in the allowance for uncollectible accounts for the six months ended March 31, 2025 and 2024 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, 2025
Allowance for Uncollectible Accounts$26,194 $15,497 $535 $(18,775)$23,451 
Six Months Ended March 31, 2024
Allowance for Uncollectible Accounts$36,295 $9,766 $468 $(6,834)$39,695 
Components of Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) and changes for the six months ended March 31, 2025 and 2024, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands): 
 Gains and Losses on Derivative Financial InstrumentsFunded Status of the Pension and Other Post-Retirement Benefit PlansTotal
Three Months Ended March 31, 2025
Balance at January 1, 2025$(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)
Three Months Ended March 31, 2024
Balance at January 1, 2024$127,064 $(59,683)$67,381 
Other Comprehensive Gains and Losses Before Reclassifications
51,418 — 51,418 
Amounts Reclassified From Other Comprehensive Income(43,459)— (43,459)
Balance at March 31, 2024$135,023 $(59,683)$75,340 
Six Months Ended March 31, 2024
Balance at October 1, 2023$4,623 $(59,683)$(55,060)
Other Comprehensive Gains and Losses Before Reclassifications
188,099 — 188,099 
Amounts Reclassified From Other Comprehensive Income(57,699)— (57,699)
Balance at March 31, 2024$135,023 $(59,683)$75,340 
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, 2025 and 2024 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,
2025202420252024
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
     Commodity Contracts($7,834)$60,184 $21,894 $79,939 Operating Revenues
     Foreign Currency Contracts(326)(36)(550)(82)Operating Revenues
 (8,160)60,148 21,344 79,857 Total Before Income Tax
 2,196 (16,689)(5,744)(22,158)Income Tax Expense
 ($5,964)$43,459 $15,600 $57,699 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, 2025At September 30, 2024
Prepayments$12,490 $18,463 
Prepaid Property and Other Taxes23,692 14,187 
Federal Income Taxes Receivable— 8,154 
State Income Taxes Receivable6,171 13,161 
Regulatory Assets36,179 38,264 
 $78,532 $92,229 
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, 2025At September 30, 2024
Accrued Capital Expenditures$40,449 $47,344 
Regulatory Liabilities16,285 29,352 
Reserve for Gas Replacement27,614 — 
Liability for Royalty and Working Interests30,697 15,007 
Federal Income Taxes Payable8,696 — 
Non-Qualified Benefit Plan Liability14,135 14,135 
Other47,049 57,065 
 $184,925 $162,903