Commitments and Contingencies (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 10, 2025	Feb. 03, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Oct. 22, 2025	Oct. 20, 2025
Loss Contingencies
Litigation Settlement, Amount Awarded to Other Party	$ 8.3	$ 0.9			$ 7.9	$ 12.9
Estimated litigation liability, current			$ 90.0	$ 21.0
Selling, general and administrative expenses
Loss Contingencies
Litigation Settlement, Fee Expense			69.0	0.0	$ 5.0
Other current liabilities
Loss Contingencies
Estimated litigation liability, current			$ 90.0	$ 21.0
Other current liabilities | New York Settlement [Member]
Loss Contingencies
Estimated litigation liability, current								$ 19.2
Other current liabilities | Multistate Settlement
Loss Contingencies
Estimated litigation liability, current							$ 70.8