STOCK-BASED COMPENSATION - Summary of Share-Based Payment Award Valuation Assumptions (Detail) - Service Based Stock Options - $ / shares	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 17.12	$ 9.02	$ 16.98
Risk-free interest rate	3.93%	3.77%	1.34%
Expected volatility	40.00%	40.00%	40.00%
Expected term (in years)	6 years	6 years	6 years
Expected dividend yield	0.00%	0.00%	0.00%