Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 192,645	$ (262,372)
Adjustments to reconcile net income (loss) to net cash flow from operating activities
Stock-based compensation	31,236	37,444
Depreciation and amortization	11,319	8,788
(Accretion) amortization of note premiums/discounts	(2,788)	896
Realized loss on investments	0	(80)
Non-cash interest expense on liability related to the sale of future royalties	10,915	12,612
Non-cash interest expense on credit facility	32,369	0
Changes in operating assets and liabilities:
Accounts receivable	(2,365)	0
Prepaid expenses and other assets	(20,936)	(2,643)
Accounts payable	(1,717)	(8,402)
Accrued expenses	18,921	(11)
Deferred revenue	43,268	(866)
Operating lease, net	(2,255)	4,417
Other	3,169	0
Net cash provided by (used in) operating activities	313,781	(210,217)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(12,813)	(102,731)
Purchases of investments	(677,892)	(309,982)
Proceeds from sales and maturities of investments	347,402	208,615
Net cash used in investing activities	(343,303)	(204,098)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the exercises of stock options	3,253	1,779
Proceeds from the issuance of common stock, net of offering costs	241,388	429,265
Proceeds from the issuance of warrants	25,000	0
Payments of debt issuance costs	(5,000)	0
Repayments of credit facility	(151,625)	0
Net cash provided by financing activities	113,016	431,044
Net increase in cash, cash equivalents and restricted cash	83,494	16,729
Effect of exchange rate on cash, cash equivalents and restricted cash	(470)	84
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
BEGINNING OF PERIOD	102,685	110,891
END OF PERIOD	185,709	127,704
Supplementary disclosure of cash flows:
Interest paid	(19)	0
Income taxes paid	(81)	(3,014)
Supplemental disclosure of non-cash investing activities:
Capital expenditures included in accrued expenses	$ 358	$ 7,265