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COMMITMENTS AND CONTINGENCIES - Schedule of Environmental Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]    
Environmental remediation liability $ 5.4 $ 4.5
Environmental Loss Contingency Statement of Financial Position Extensible Enumeration Not Disclosed Flag Environmental remediation liability Environmental remediation liability
Reported as:    
Other current liabilities $ 1.8 $ 0.8
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Other long-term liabilities $ 3.5 $ 3.7
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities