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Income Taxes - Schedule of Reconciliation of U.S. Federal Statutory Tax Rate to Effective Tax Rate (Details) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% | 21.00%
Difference in tax rate due to: |  |  |
Goodwill impairment not deductible for tax | 0.00% | 11.60% | (7.30%)
State income taxes, net of federal benefit | 4.60% | 6.80% | (1.70%)
Investment tax credits | (12.70%) | (6.80%) | 0.50%
Valuation allowance adjustments | (8.80%) | (6.30%) | 1.10%
Regulated entity depreciation normalization | (2.00%) | (4.50%) | 0.70%
Notional interest deduction | (1.70%) | (3.80%) | 0.70%
Nontaxable sale of equity investment | 1.50% | 0.00% | 0.00%
State NOL adjustment upon disposition | 0.00% | 2.40% | 0.00%
Uncertain tax positions | 0.80% | (2.40%) | (0.70%)
Impairment of equity investment | 0.00% | 2.20% | 0.00%
Federal refund interest accrual | (0.50%) | (1.10%) | 0.00%
Effects of foreign operations | (0.60%) | 0.10% | 3.10%
Other, net | 1.70% | (1.90%) | 0.60%
Effective tax rate | 2.60% | 20.90% | 18.20%
Effects of tax rate changes – State, net of federal benefit |  |  |
Difference in tax rate due to: |  |  |
Effects of tax rate changes – State, net of federal benefit | (0.70%) | 3.60% | 0.20%

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