STOCK INCENTIVE PLAN - Performance Share Assumptions (Details) - Performance Shares - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility	68.00%
Expected volatility, minimum		63.00%	61.00%
Expected volatility, maximum
Range of risk-free interest rates	4.15%	0.83%	0.21%
Expected life	3 years	3 years	3 years
Fair value (in dollars per share)	$ 121.52	$ 122.25	$ 33.80