Liability Related to the Sale of Future Royalties - Activity (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Liability, Sale Of Future Royalties [Roll Forward]
Beginning carrying value	$ 341,361	$ 268,326	$ 268,326
Milestone payment received	0		50,000
Non-cash interest expense recognized	18,893	$ 17,705	23,035
Ending carrying value	$ 360,254		$ 341,361