COMMITMENTS AND CONTINGENCIES - Schedule of Environmental Loss Contingencies by Site (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Accrual for Environmental Loss Contingencies Disclosure [Abstract]
Environmental remediation liability	$ 4.5	$ 5.4
Environmental Loss Contingency Statement of Financial Position Extensible Enumeration Not Disclosed Flag [Extensible Enumeration]	Environmental remediation liability	Environmental remediation liability
Reported as:
Other current liabilities	$ 0.8	$ 1.5
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Other current liabilities	Other current liabilities
Other long-term liabilities	$ 3.7	$ 3.9
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other long-term liabilities	Other long-term liabilities