LEASES - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	May 20, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capital expenditures		$ 69.7	$ 114.2	$ 154.3
Present value of lease liabilities		53.9
Operating lease assets	$ 1.4	52.3	$ 50.0
Increase in equipment	1.3
Fortress
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capital expenditures	2.8
Present value of lease liabilities	$ 1.5
Property, plant and equipment		$ 2.7