DEBT - Schedule of long-term debt (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
DEBT
Total debt before unamortized debt issuance costs	$ 406,702	$ 405,289
Less: Debt issuance costs not amortized	(10,687)	(11,950)
Total debt, net of unamortized debt issuance costs	396,015	393,339
Less: Current portion	(3,037)	(3,538)
Total Long-term debt	392,978	389,801
Seller Note – Bolder BioPath (Related party)
DEBT
Total debt before unamortized debt issuance costs	320	376
Seller Note – Preclinical Research Services
DEBT
Total debt before unamortized debt issuance costs	0	464
Seller Payable - Orient BioResource Center
DEBT
Total debt before unamortized debt issuance costs	3,235	3,700
Seller Note – Histion (Related party)
DEBT
Total debt before unamortized debt issuance costs	48	84
Second Lien Notes
DEBT
Total debt before unamortized debt issuance costs	19,221	17,846
Convertible Senior Notes
DEBT
Total debt before unamortized debt issuance costs	111,551	109,979
Term Loan Facility, DDTL and Incremental Term Loans
DEBT
Total debt before unamortized debt issuance costs	$ 272,327	$ 272,840