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DEBT - Schedule of long-term debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
DEBT      
Total debt before unamortized debt issuance costs $ 411,699 $ 405,289  
Total debt, net of unamortized debt issuance costs (9,576) (11,950)  
Total 402,123 393,339  
Less: Current portion (402,123) (3,538)  
Total Long-term debt $ 0 $ 389,801  
Term Loan      
DEBT      
Effective interest rate (percent) 12.58% 11.39% 10.41%
New Delayed Draw Term Loan      
DEBT      
Effective interest rate (percent) 12.68% 11.50% 10.57%
Delayed Draw Term Loan      
DEBT      
Effective interest rate (percent) 12.53% 11.37% 10.41%
Seller Note - Bolder BioPATH      
DEBT      
Total debt before unamortized debt issuance costs $ 150 $ 376  
Seller Note - Pre-Clinical Research Services      
DEBT      
Total debt before unamortized debt issuance costs 0 464  
Seller Payable Orient Bio Resource Center      
DEBT      
Total debt before unamortized debt issuance costs 3,235 3,700  
Seller Note - Histion      
DEBT      
Total debt before unamortized debt issuance costs 0 84  
Second Lien Notes      
DEBT      
Total debt before unamortized debt issuance costs 23,220 17,846  
Total debt, net of unamortized debt issuance costs (1,297) (1,563)  
Convertible Senior Notes      
DEBT      
Total debt before unamortized debt issuance costs 116,440 109,979  
Total debt, net of unamortized debt issuance costs (2,093) (3,031)  
Term Loan Facility, Initial DDTL and Incremental Term Loans      
DEBT      
Total debt before unamortized debt issuance costs $ 268,654 $ 272,840