Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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Commitments and Contingencies (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 10, 2025	Feb. 03, 2025	Mar. 31, 2025	Mar. 31, 2025	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2024
Loss Contingencies
Litigation Settlement, Amount Awarded to Other Party	$ 8.3	$ 0.9			$ 7.9	$ 12.9
Selling, general and administrative expenses
Loss Contingencies
Litigation Settlement, Fee Expense			$ 0.9	$ 0.9
Other current liabilities
Loss Contingencies
Estimated litigation liability, current			$ 21.9	$ 21.9			$ 21.0