Organization and Summary of Significant Accounting Policies - Foreign Currency and Advertising (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising expense	$ 7.1	$ 6.2	$ 4.9
Digital Advertising
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising expense	$ 3.9	$ 3.6	$ 2.9