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Income Taxes - Reconciliation of Expected Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Comparison of income tax expense (benefit) and tax computed at the statutory rate
Income taxes at federal statutory rate	$ 995.4	$ 1,319.8	$ 1,326.1
Increase (decrease) in tax resulting from:
State income taxes, net of federal benefit	154.1	205.8	208.1
Valuation allowance	(0.3)	0.1	(3.1)
Tax credits	(39.5)	(70.4)	(44.4)
Excess tax benefit from equity compensation	(16.0)	(42.7)	(25.6)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	0.0	(1.4)	(1.5)
Other	25.3	67.5	59.9
Total income tax expense (benefit)	$ 1,119.0	$ 1,478.7	$ 1,519.5
Federal statutory rate	21.00%	21.00%	21.00%

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