Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Loss Contingencies
Estimated litigation liability, current	$ 21.0	$ 21.0
Litigation Settlement, Amount Awarded to Other Party	7.9		$ 12.9
Selling, general and administrative expenses
Loss Contingencies
Litigation Settlement, Fee Expense		$ 5.0	$ 7.5
Other current liabilities
Loss Contingencies
Estimated litigation liability, current	$ 21.0