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Income Taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Effective Tax Rate (Details) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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 | 11.60% | (7.30%) | 0.00%
State income taxes, net of federal benefit | 6.80% | (1.70%) | 2.30%
Investment tax credits | (6.80%) | 0.50% | 0.00%
Valuation allowance adjustments | (6.30%) | 1.10% | (0.50%)
Regulated entity depreciation normalization | (4.50%) | 0.70% | (0.80%)
Notional interest deduction | (3.80%) | 0.70% | (0.90%)
State NOL adjustment upon disposition | 2.40% | 0.00% | 0.00%
Uncertain tax positions | (2.40%) | (0.70%) | 0.00%
Impairment of equity investment | 2.20% | 0.00% | 0.00%
Federal refund interest accrual | (1.10%) | 0.00% | 0.00%
Effects of foreign operations | 0.10% | 3.10% | 5.30%
Other, net | (1.90%) | 0.60% | (0.10%)
Effective tax rate | 20.90% | 18.20% | 22.60%
Effects of tax rate changes – State, net of federal benefit |  |  |
Difference in tax rate due to: |  |  |
Effects of tax rate changes | 3.60% | 0.20% | (1.40%)
Effects of tax rate changes - International |  |  |
Difference in tax rate due to: |  |  |
Effects of tax rate changes | 0.00% | 0.00% | (2.30%)

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