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Supplemental Statement of Operations Information - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]      
Research and Development Expense $ 20.5 $ 25.9 $ 24.5
Advertising Expense 5.8 4.7 5.5
Amortization of Debt Issuance Costs 1.0 1.0 1.0
Interest Costs Capitalized (0.1) (1.6) (2.6)
Interest Expense, Other 1.7 0.1 0.3
Interest Expense, Operating and Nonoperating 21.5 18.4 17.6
Interest Income, Other (8.8) (3.7) (0.7)
Interest Income (Expense), Operating (12.7) (14.7) (16.9)
4.0% Senior Notes      
Debt Instrument [Line Items]      
Interest Expense, Debt 18.0 18.0 18.0
ABL Agreement      
Debt Instrument [Line Items]      
Interest Expense, Debt $ 0.9 $ 0.9 $ 0.9