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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Current tax expense (benefit):      
Federal $ 821.4 $ 1,200.9 $ 1,293.0
State 174.4 258.8 272.4
Total current tax expense (benefit) 995.8 1,459.7 1,565.4
Deferred tax expense:      
Federal 104.8 15.5 (39.0)
State 18.4 3.5 (6.9)
Total deferred tax expense (benefit) 123.2 19.0 (45.9)
Total income tax expense (benefit) $ 1,119.0 $ 1,478.7 $ 1,519.5
Effective tax rate 23.60% 23.50% 24.10%