DEBT - Schedule of long-term debt (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
DEBT
Total debt before unamortized debt issuance costs	$ 409,179	$ 405,289
Less: Debt issuance costs not amortized	(12,637)	(11,950)
Total debt, net of unamortized debt issuance costs	396,542	393,339
Less: Current portion	(6,206)	(3,538)
Total Long-term debt	390,336	389,801
Seller Note – Bolder BioPath (related party)
DEBT
Total debt before unamortized debt issuance costs	207	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	0	84
Second Lien Notes
DEBT
Total debt before unamortized debt issuance costs	21,816	17,846
Convertible Senior Notes
DEBT
Total debt before unamortized debt issuance costs	114,754	109,979
Term Loan Facility, DDTL and Incremental Term Loans
DEBT
Total debt before unamortized debt issuance costs	$ 269,167	$ 272,840