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Income Taxes - Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Current tax expense (benefit): |  |  |
Federal | $ 978.1 | $ 484.0 | $ 407.3
State | 197.0 | 104.4 | 79.3
Total current tax expense (benefit) | 1,175.1 | 588.4 | 486.6
Deferred tax expense: |  |  |
Federal | (12.7) | 20.0 | 13.9
State | 2.7 | (5.9) | 6.2
Total deferred tax expense (benefit) | (10.0) | 14.1 | 20.1
Total income tax expense (benefit) | $ 1,165.1 | $ 602.5 | $ 506.7
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | 0.40% |

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