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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2024
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):
Nine Months Ended
 June 30, 2024		Nine Months Ended
 June 30, 2023
 Balance at
June 30, 2024		Balance at October 1, 2023Balance at
June 30, 2023		Balance at October 1, 2022
Cash and Temporary Cash Investments$81,414 $55,447 $53,415 $46,048 
Hedging Collateral Deposits— — — 91,670 
Cash, Cash Equivalents, and Restricted Cash$81,414 $55,447 $53,415 $137,718 
Schedule of Allowance for Uncollectible Accounts Activity in the allowance for uncollectible accounts for the nine months ended June 30, 2024 and 2023 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
Nine Months Ended June 30, 2024
Allowance for Uncollectible Accounts$36,295 $11,774 $698 $(16,145)$32,622 
Nine Months Ended June 30, 2023
Allowance for Uncollectible Accounts$40,228 $13,142 $1,316 $(11,578)$43,108 
Components of Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) and changes for the nine months ended June 30, 2024 and 2023, 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 June 30, 2024
Balance at April 1, 2024$135,023 $(59,683)$75,340 
Other Comprehensive Gains and Losses Before Reclassifications
(15,850)— (15,850)
Amounts Reclassified From Other Comprehensive Loss(54,440)— (54,440)
Balance at June 30, 2024$64,733 $(59,683)$5,050 
Nine Months Ended June 30, 2024
Balance at October 1, 2023$4,623 $(59,683)$(55,060)
Other Comprehensive Gains and Losses Before Reclassifications
172,249 — 172,249 
Amounts Reclassified From Other Comprehensive Income(112,139)— (112,139)
Balance at June 30, 2024$64,733 $(59,683)$5,050 
Three Months Ended June 30, 2023
Balance at April 1, 2023$(1,294)$(53,570)$(54,864)
Other Comprehensive Gains and Losses Before Reclassifications
47,359 — 47,359 
Amounts Reclassified From Other Comprehensive Income(41,879)— (41,879)
Balance at June 30, 2023$4,186 $(53,570)$(49,384)
Nine Months Ended June 30, 2023
Balance at October 1, 2022$(572,163)$(53,570)$(625,733)
Other Comprehensive Gains and Losses Before Reclassifications
488,726 — 488,726 
Amounts Reclassified From Other Comprehensive Income87,623 — 87,623 
Balance at June 30, 2023$4,186 $(53,570)$(49,384)
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 nine months ended June 30, 2024 and 2023 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
June 30,		Nine Months Ended
 June 30,
2024202320242023
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
     Commodity Contracts$75,462 $57,842 $155,401 ($120,088)Operating Revenues
     Foreign Currency Contracts(116)(150)(198)(502)Operating Revenues
 75,346 57,692 155,203 (120,590)Total Before Income Tax
 (20,906)(15,813)(43,064)32,967 Income Tax Expense
 $54,440 $41,879 $112,139 ($87,623)Net of Tax
Schedule of Other Current Assets The components of the Company’s Other Current Assets are as follows (in thousands):
                            At June 30, 2024At September 30, 2023
Prepayments$23,972 $18,966 
Prepaid Property and Other Taxes11,462 14,186 
Federal Income Taxes Receivable— 14,602 
State Income Taxes Receivable12,298 16,133 
Regulatory Assets35,191 36,373 
 $82,923 $100,260 
Schedule of Other Accruals and Current Liabilities The components of the Company’s Other Accruals and Current Liabilities are as follows (in thousands):
                            At June 30, 2024At September 30, 2023
Accrued Capital Expenditures$52,620 $43,323 
Regulatory Liabilities27,538 38,105 
Reserve for Gas Replacement6,657 — 
Liability for Royalty and Working Interests17,670 17,679 
Federal Income Taxes Payable1,027 — 
Non-Qualified Benefit Plan Liability13,052 13,052 
Other50,569 48,815 
 $169,133 $160,974