Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (609,693)	$ (209,275)	$ (176,494)
Adjustments to reconcile net loss to net cash flow from operating activities:
Stock-based compensation	73,968	78,130	120,893
Depreciation and amortization	18,595	12,493	10,421
(Accretion) Amortization of note premiums/discounts	(3,244)	(2,017)	2,910
Non-cash interest expense on liability related to the sale of future royalties	23,035	18,326	0
Non-cash interest expense on credit facility	9,317	0	0
Realized loss on investments	80	0	4,432
Changes in operating assets and liabilities:
Accounts receivable	0	1,410	8,845
Prepaid expenses and other current assets	(1,664)	11,603	(19,291)
Accounts payable	(5,536)	32,998	(6,589)
Accrued expenses	32,117	(14,965)	17,750
Deferred revenue	(866)	(129,183)	(112,501)
Operating lease, net	2,240	46,590	13,428
Other	(1,200)	0	65
Net cash used in operating activities	(462,851)	(153,890)	(136,131)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(141,469)	(176,737)	(52,777)
Purchases of investments	(720,947)	(246,141)	(223,391)
Proceeds from sales and maturities of investments	442,344	326,723	270,751
Net cash used in investing activities	(420,072)	(96,155)	(5,417)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuance of common stock, net of offering costs	429,265	0	0
Proceeds from the sale of future royalties	50,000	250,000	0
Proceeds from credit facility	392,000	0	0
Payment of debt issuance costs	(3,134)	0	0
Proceeds from the exercises of stock options	2,389	3,053	5,186
Proceeds from investment in joint venture	0	0	60,000
Net cash provided by financing activities	870,520	253,053	65,186
Net (decrease) increase in cash, cash equivalents and restricted cash	(12,403)	3,008	(76,362)
Effect of exchange rate on cash, cash equivalents and restricted cash	4,197	(122)	(67)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
BEGINNING OF PERIOD	110,891	108,005	184,434
END OF PERIOD	102,685	110,891	108,005
Supplementary disclosure of cash flows:
Income Taxes Paid	(3,744)	0	(2)
Supplementary disclosure of non-cash investing activities:
Capital expenditures included in accounts payable and accrued expenses	4,206	14,044	17,578
Supplementary disclosure of non-cash financing activities:
Debt issuance costs included in accrued expenses	$ 5,000	$ 0	$ 0