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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, notional amount	$ 120.4		$ 120.4		$ 136.6
Total (gain) loss on derivatives	(23.6)	$ 10.4	(21.8)	$ 9.6
Margin accounts cash collateral	12.8		12.8
Cash collateral posted	$ 0.6		$ 0.6		$ 17.3

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.