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Basis of Presentation and Summary of Significant Accounting Policies - Advertising Costs and Expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]      
Advertising expense $ 36.1 $ 19.3 $ 22.5