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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Jun. 30, 2023
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, 2023		Nine Months Ended
 June 30, 2022
 Balance at
June 30, 2023		Balance at October 1, 2022Balance at
June 30, 2022		Balance at October 1, 2021
Cash and Temporary Cash Investments$53,415 $46,048 $432,576 $31,528 
Hedging Collateral Deposits— 91,670 154,470 88,610 
Cash, Cash Equivalents, and Restricted Cash$53,415 $137,718 $587,046 $120,138 
Schedule of Allowance for Uncollectible Accounts Activity in the allowance for uncollectible accounts for the nine months ended June 30, 2023 and 2022 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, 2023
Allowance for Uncollectible Accounts$40,228 $13,142 $1,316 $(11,578)$43,108 
Nine Months Ended June 30, 2022
Allowance for Uncollectible Accounts$31,639 $12,024 $1,211 $(2,891)$41,983 
Components of Accumulated Other Comprehensive Loss The components of Accumulated Other Comprehensive Loss and changes for the nine months ended June 30, 2023 and 2022, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands): 
 Gains and Losses on Derivative Financial InstrumentsFunded Status of the Pension and Other Post-Retirement Benefit PlansTotal
Three Months Ended June 30, 2023
Balance at April 1, 2023$(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)
Three Months Ended June 30, 2022
Balance at April 1, 2022$(584,812)$(69,442)$(654,254)
Other Comprehensive Gains and Losses Before Reclassifications
(145,322)— (145,322)
Amounts Reclassified From Other Comprehensive Loss216,708 — 216,708 
Balance at June 30, 2022$(513,426)$(69,442)$(582,868)
Nine Months Ended June 30, 2022
Balance at October 1, 2021$(449,962)$(63,635)$(513,597)
Other Comprehensive Gains and Losses Before Reclassifications
(492,841)— (492,841)
Amounts Reclassified From Other Comprehensive Loss429,377 — 429,377 
Other Post-Retirement Adjustment for Regulatory Proceeding— (5,807)(5,807)
Balance at June 30, 2022$(513,426)$(69,442)$(582,868)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss The details about the reclassification adjustments out of accumulated other comprehensive loss for the nine months ended June 30, 2023 and 2022 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other Comprehensive Loss ComponentsAmount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive LossAffected Line Item in the Statement Where Net Income is Presented
Three Months Ended
June 30,		Nine Months Ended
 June 30,
2023202220232022
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
     Commodity Contracts$57,842 ($298,372)($120,088)($591,271)Operating Revenues
     Foreign Currency Contracts(150)1 (502)91 Operating Revenues
 57,692 (298,371)(120,590)(591,180)Total Before Income Tax
 (15,813)81,663 32,967 161,803 Income Tax Expense
 $41,879 ($216,708)($87,623)($429,377)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, 2023At September 30, 2022
Prepayments$24,060 $17,757 
Prepaid Property and Other Taxes11,420 14,321 
Prepaid State Income Taxes5,804 5,933 
Regulatory Assets30,302 21,358 
 $71,586 $59,369 
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, 2023At September 30, 2022
Accrued Capital Expenditures$51,078 $64,720 
Regulatory Liabilities38,499 31,293 
Reserve for Gas Replacement86,509 — 
Liability for Royalty and Working Interests15,754 86,206 
Non-Qualified Benefit Plan Liability17,474 17,474 
Other51,583 57,634 
 $260,897 $257,327