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Income Taxes (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Schedule of Components of Federal and State Income Taxes Included in the Consolidated Statements of Income | The components of federal and state income taxes included in the Consolidated Statements of Income are as follows:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (Thousands)
Current Income Taxes — |  |  |  |  |
Federal | $ | 42,089 |  |  | $ | 6,453 |  |  | $ | 11,744 |
State | 12,186 |  |  | 5,899 |  |  | 1,386 |
Deferred Income Taxes — |  |  |  |  |
Federal | 90,881 |  |  | 894 |  |  | 106,801 |
State | 30,393 |  |  | (3,504) |  |  | 44,602 |
Total Income Taxes | $ | 175,549 |  |  | $ | 9,742 |  |  | $ | 164,533 |
Schedule of Income Tax Reconciliation by Applying Federal Income Tax Rate | The following is a reconciliation of this difference:
| Year Ended September 30
| 2025 |  | 2024 |  | 2023
| (Thousands)
U.S. Income Before Income Taxes | $ | 694,053 |  |  | $ | 87,255 |  |  | $ | 641,399 |
Income Tax Expense, Computed at U.S. Federal Statutory Rate of 21% | $ | 145,751 |  |  | $ | 18,324 |  |  | $ | 134,694 |
State Income Taxes | 33,637 |  |  | 1,892 |  |  | 36,331 |
Amortization of Excess Deferred Federal Income Taxes | (4,617) |  |  | (5,607) |  |  | (6,053) |
Plant Flow Through Items | (5,070) |  |  | (6,135) |  |  | (2,856) |
Stock Compensation | 2,245 |  |  | 1,758 |  |  | 957 |
Miscellaneous | 3,603 |  |  | (490) |  |  | 1,460 |
Total Income Taxes | $ | 175,549 |  |  | $ | 9,742 |  |  | $ | 164,533 |
Schedule of Significant Components of Deferred Tax Liabilities and Assets | Significant components of the Company’s deferred tax liabilities and assets were as follows:
| At September 30
| 2025 |  | 2024
| (Thousands)
Deferred Tax Liabilities: |  |  |
Unrealized Hedging Gains | $ | 9,036 |  |  | $ | 22,433 |
Property, Plant and Equipment | 1,222,869 |  |  | 1,134,727 |
Pension and Other Post-Retirement Benefit Costs | 72,691 |  |  | 59,877 |
Other | 24,531 |  |  | 13,885 |
Total Deferred Tax Liabilities | 1,329,127 |  |  | 1,230,922 |
Deferred Tax Assets: |  |  |
Tax Loss and Credit Carryforwards | (28,364) |  |  | (31,111) |
Pension and Other Post-Retirement Benefit Costs | (54,071) |  |  | (49,622) |
Other | (21,430) |  |  | (39,024) |
Total Deferred Tax Assets | (103,865) |  |  | (119,757) |
Total Net Deferred Income Taxes | $ | 1,225,262 |  |  | $ | 1,111,165 |
Schedule of Operating Loss and Tax Credit Carryforwards | Tax carryforwards available at September 30, 2025, were as follows:
Jurisdiction |  | Tax Attribute |  | Amount (Thousands) |  | Expires
Pennsylvania |  | Net Operating Loss |  | $ | 422,900 |  |  | 2031-2045

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