Organization and Summary of Significant Accounting Policies - Foreign Currency and Advertising (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising expense	$ 4,900	$ 2,300	$ 1,600
Digital Advertising
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising expense	$ 2,900	$ 300