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REVENUE RECOGNITION - Rollforward of Allowance for Product Returns (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Allowance For Product Returns [Roll Forward]      
Beginning Balance $ 15.5 $ 11.8 $ 12.8
Charged to Profit & Loss 8.7 12.4 1.5
Deductions (11.2) (19.8) (2.9)
Other Adjustments (0.2) 11.1 0.4
Ending Balance $ 12.8 $ 15.5 $ 11.8