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Income Taxes - Federal Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Taxes |  |  |
Tax expense related to valuation allowances | $ (10,300) |  |
Rate reconciliation |  |  |
Tax at federal statutory rate | 150,800 | $ 44,800 | $ 115,600
State income tax, net of federal benefit | (8,500) | (7,100) | 20,200
Foreign residual income | 43,800 | 59,400 | 46,400
Nondeductible costs | 20,600 | 10,700 | 19,700
ACAP investment sale | 20,200 |  |
Change in uncertain tax positions | 18,600 | 9,400 | 15,400
Tax rate changes | 1,200 | (3,200) | (4,100)
Audit settlement | 500 | 1,900 | (1,500)
Income tax credits and incentives | (63,500) | (68,200) | (51,000)
Valuation allowance | (12,600) | 16,600 | (18,000)
Exclusion of tax on non-controlling interests | (12,500) | (9,400) | (5,100)
Return to provision | (3,700) | (500) | (1,500)
Foreign tax rate differential | (2,800) | 200 | 1,100
Tax exempt income | (2,500) | (3,300) | (5,900)
Other items, net | 3,300 | 4,800 | 4,800
Total income tax expense | $ 152,900 | $ 56,052 | $ 136,051
Major elements contributing to the difference between the U.S. federal statutory rate of 21% for fiscal year 2022, 2021 and 2020 and the effective tax rate |  |  |
Tax at federal statutory rate (as a percent) | 21.00% | 21.00% | 21.00%
State income tax, net of federal benefit (as a percent) | (1.20%) | (3.30%) | 3.70%
Foreign residual income (as a percent) | 6.10% | 27.80% | 8.40%
Nondeductible costs (as a percent) | 2.90% | 5.00% | 3.60%
ACAP investment sale (as a percent) | 2.80% |  |
Change in uncertain tax positions (as a percent) | 2.60% | 4.40% | 2.80%
Tax rate changes (as a percent) | 0.20% | (1.50%) | (0.70%)
Audit settlement (as a percent) | 0.10% | 0.90% | (0.30%)
Income tax credits and incentive (as a percent) | (8.80%) | (31.90%) | (9.30%)
Valuation allowance (as a percent) | (1.80%) | 7.80% | (3.30%)
Exclusion of tax on non-controlling interests (as a percent) | (1.70%) | (4.40%) | (0.90%)
Return to provision (as a Percent) | (0.50%) | (0.20%) | (0.30%)
Foreign tax rate differential (as a percent) | (0.40%) | 0.10% | 0.20%
Tax exempt income (as a percent) | (0.40%) | (1.50%) | (1.10%)
Other items, net (as a percent) | 0.40% | 2.10% | 0.90%
Total income tax expense (as a percent) | 21.30% | 26.30% | 24.70%

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