Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenues:
Total net revenues	$ 331,504	$ 294,475	$ 327,891
United States
Revenues:
Total net revenues	139,441	87,120	100,564
Other Americas
Revenues:
Total net revenues	623	244	99
Germany
Revenues:
Total net revenues	94,050	87,211	74,550
Other Europe, Middle East and Africa
Revenues:
Total net revenues	18,018	15,603	15,579
Japan
Revenues:
Total net revenues	42,466	40,122	74,480
Other Asia-Pacific
Revenues:
Total net revenues	$ 36,906	$ 64,175	$ 62,619