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Summary Of Significant Accounting Policies (Tables) | 6 Months Ended
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Mar. 31, 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):
| Six Months Ended March 31, 2024 |  | Six Months Ended March 31, 2023
| Balance at March 31, 2024 |  | Balance at October 1, 2023 |  | Balance at March 31, 2023 |  | Balance at October 1, 2022
Cash and Temporary Cash Investments | $ | 50,769 |  |  | $ | 55,447 |  |  | $ | 71,533 |  |  | $ | 46,048 |
Hedging Collateral Deposits | — |  |  | — |  |  | — |  |  | 91,670 |
Cash, Cash Equivalents, and Restricted Cash | $ | 50,769 |  |  | $ | 55,447 |  |  | $ | 71,533 |  |  | $ | 137,718 |
Schedule of Allowance for Uncollectible Accounts | Activity in the allowance for uncollectible accounts for the six months ended March 31, 2024 and 2023 are as follows (in thousands):
| Balance at Beginning of Period |  | Additions Charged to Costs and Expenses |  | Discounts on Purchased Receivables |  | Net Accounts Receivable Written-Off |  | Balance at End of Period
Six Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |
Allowance for Uncollectible Accounts | $ | 36,295 |  |  | $ | 9,766 |  |  | $ | 468 |  |  | $ | (6,834) |  |  | $ | 39,695 |
Six Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Allowance for Uncollectible Accounts | $ | 40,228 |  |  | $ | 10,973 |  |  | $ | 916 |  |  | $ | (3,971) |  |  | $ | 48,146 |
Components of Accumulated Other Comprehensive Income (Loss) | The components of Accumulated Other Comprehensive Income (Loss) and changes for the six months ended March 31, 2024 and 2023, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands):
| Gains and Losses on Derivative Financial Instruments |  |  |  | Funded Status of the Pension and Other Post-Retirement Benefit Plans |  | Total
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 |
Three Months Ended March 31, 2023 |  |  |  |  |  |  |
Balance at January 1, 2023 | $ | (240,176) |  |  |  |  | $ | (53,570) |  |  | $ | (293,746) |
Other Comprehensive Gains and Losses Before Reclassifications | 225,150 |  |  |  |  | — |  |  | 225,150 |
Amounts Reclassified From Other Comprehensive Income | 13,732 |  |  |  |  | — |  |  | 13,732 |
Balance at March 31, 2023 | $ | (1,294) |  |  |  |  | $ | (53,570) |  |  | $ | (54,864) |
Six Months Ended March 31, 2023 |  |  |  |  |  |  |
Balance at October 1, 2022 | $ | (572,163) |  |  |  |  | $ | (53,570) |  |  | $ | (625,733) |
Other Comprehensive Gains and Losses Before Reclassifications | 441,367 |  |  |  |  | — |  |  | 441,367 |
Amounts Reclassified From Other Comprehensive Income | 129,502 |  |  |  |  | — |  |  | 129,502 |
Balance at March 31, 2023 | $ | (1,294) |  |  |  |  | $ | (53,570) |  |  | $ | (54,864) |
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, 2024 and 2023 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other Comprehensive Income (Loss) Components |  | Amount 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, |
| 2024 |  | 2023 |  | 2024 |  | 2023 |
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |
Commodity Contracts |  | $60,184 |  |  | ($18,768) |  |  | $79,939 |  |  | ($177,930) |  |  | Operating Revenues
Foreign Currency Contracts |  | (36) |  |  | (172) |  |  | (82) |  |  | (351) |  |  | Operating Revenues
|  | 60,148 |  |  | (18,940) |  |  | 79,857 |  |  | (178,281) |  |  | Total Before Income Tax
|  | (16,689) |  |  | 5,208 |  |  | (22,158) |  |  | 48,779 |  |  | Income Tax Expense
|  | $43,459 |  |  | ($13,732) |  |  | $57,699 |  |  | ($129,502) |  |  | 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, 2024 |  | At September 30, 2023
Prepayments | $ | 13,693 |  |  | $ | 18,966 |
Prepaid Property and Other Taxes | 23,308 |  |  | 14,186 |
Federal Income Taxes Receivable | — |  |  | 14,602 |
State Income Taxes Receivable | 12,277 |  |  | 16,133 |
Regulatory Assets | 35,845 |  |  | 36,373 |
| $ | 85,123 |  |  | $ | 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 March 31, 2024 |  | At September 30, 2023
Accrued Capital Expenditures | $ | 40,361 |  |  | $ | 43,323 |
Regulatory Liabilities | 37,192 |  |  | 38,105 |
Reserve for Gas Replacement | 20,139 |  |  | — |
Liability for Royalty and Working Interests | 19,198 |  |  | 17,679 |
Federal Income Taxes Payable | 11,747 |  |  | — |
Non-Qualified Benefit Plan Liability | 13,052 |  |  | 13,052 |
Other | 42,277 |  |  | 48,815 |
| $ | 183,966 |  |  | $ | 160,974 |

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