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Organization and Summary of Significant Accounting Policies - Foreign Currency and Advertising (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Advertising expense $ 6.2 $ 4.9 $ 2.3
Digital Advertising      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Advertising expense $ 3.6 $ 2.9 $ 0.3