REVENUE RECOGNITION - Schedule of Rollforward of Allowance for Product Returns (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Allowance For Product Returns [Roll Forward]
Beginning Balance	$ 12.8	$ 15.5	$ 11.8
Charged to Profit & Loss	28.6	8.7	12.4
Deductions	(27.3)	(11.2)	(19.8)
Other Adjustments	0.3	(0.2)	11.1
Ending Balance	$ 14.4	$ 12.8	$ 15.5