DEBT - Schedule of Effective Interest Rates (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Term Loan
DEBT
Effective interest rates (percent)	11.41%	11.67%	11.55%	11.43%
Delayed Draw Term Loan
DEBT
Effective interest rates (percent)	11.39%	11.66%	11.53%	11.41%
Additional Term Loans
DEBT
Effective interest rates (percent)	11.52%	11.78%	11.66%	11.54%