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Summary of Significant Accounting Policies, Advertising Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Advertising Costs [Abstract]      
Advertising cost $ 13.4 $ 4.5 $ 5.4
Net of related co-op assistance $ 1.8 $ 0.7 $ 0.7