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CONTINGENT LIABILITIES AND ENVIRONMENTAL RESERVES (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Site Contingency [Line Items]
Environmental liability reserves	$ 17.2	$ 17.3
Diamond Alkali
Site Contingency [Line Items]
Environmental liability reserves	$ 9.8	$ 9.8

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details