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Income Taxes - Reconciliation of Expected Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Comparison of income tax expense (benefit) and tax computed at the statutory rate
Income taxes at federal statutory rate	$ 1,602.2	$ 1,124.8	$ 626.4
Increase (decrease) in tax resulting from:
State income taxes, net of federal benefit	210.0	166.9	79.1
Valuation allowance	(2.1)	(3.3)	(11.2)
Tax credits	(100.8)	(116.3)	(93.4)
Excess tax benefit from equity compensation	(20.1)	(38.4)	(22.3)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	0.0	(6.0)	8.9
Other	44.9	37.4	15.0
Total income tax expense (benefit)	$ 1,734.1	$ 1,165.1	$ 602.5

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