Balance Sheet Accounts (Tables)

6 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property and Equipment

The following table summarizes the Company’s major classes of property, plant and equipment:

	March 31, 2025		September 30, 2024
	(in thousands)
Land	$	2,996	$	2,996
Buildings	248,893		75,988
Research equipment	60,259		65,353
Manufacturing equipment	13,812		—
Furniture	5,594		5,594
Computers and software	1,033		981
Leasehold improvements	104,401		104,410
Construction in progress	16,245		188,731
	453,233		444,053
Less: Accumulated depreciation and amortization	(68,430)		(58,021)
Property, plant and equipment, net	$	384,803	$	386,032

Schedule of Accrued Expenses

Accrued expenses consisted of the following as of:

	March 31, 2025		September 30, 2024
	(in thousands)
Accrued R&D expenses	$	42,963	$	28,069
Accrued R&D expenses; co-development	28,755		23,351
Accrued capital expenditures	358		4,206
Other	6,374		7,391
Total accrued expenses	$	78,450	$	63,017