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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

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