Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Total net revenues	$ 50,896	$ 138,335
United States
Revenues:
Total net revenues	9,448	99,469
Other Americas
Revenues:
Total net revenues	197	84
Germany
Revenues:
Total net revenues	19,409	19,133
Other Europe, Middle East and Africa
Revenues:
Total net revenues	5,543	4,775
Japan
Revenues:
Total net revenues	5,957	5,623
Other Asia-Pacific
Revenues:
Total net revenues	$ 10,342	$ 9,251