DEBT - Schedule of long-term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
DEBT
Total debt before unamortized debt issuance costs	$ 390,393	$ 389,142
Less: Debt issuance costs not amortized	(9,760)	(11,397)
Total debt, net of unamortized debt issuance costs	380,633	377,745
Less: Current portion	(380,358)	(7,950)
Total Long-term debt	275	369,795
Seller Note – Bolder BioPath (Related party)
DEBT
Total debt before unamortized debt issuance costs	489	602
Seller Note – Preclinical Research Services
DEBT
Total debt before unamortized debt issuance costs	503	541
Seller Payable - Orient BioResource Center
DEBT
Total debt before unamortized debt issuance costs	3,680	3,649
Seller Note – Histion (Related party)
DEBT
Total debt before unamortized debt issuance costs	156	229
Seller Note – Protypia (Related party)
DEBT
Total debt before unamortized debt issuance costs	0	400
Economic Injury Disaster Loan
DEBT
Total debt before unamortized debt issuance costs	0	140
Convertible Senior Notes
DEBT
Total debt before unamortized debt issuance costs	113,716	110,651
Term Loan Facility, DDTL and Incremental Term Loans
DEBT
Total debt before unamortized debt issuance costs	$ 271,849	$ 272,930