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RELATED PARTY TRANSACTIONS (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
Related Party Transaction [Line Items]          
Selling, general and administrative expenses $ 91.5 $ 90.5 $ 169.5 $ 170.6  
Accounts payable 140.8   140.8   $ 119.5
Co-Packing Agreement          
Related Party Transaction [Line Items]          
Purchase from related party 27.1 20.8 46.5 27.1  
Related Party          
Related Party Transaction [Line Items]          
Accounts payable 2.6   2.6   $ 3.7
Related Party | Master Service Agreement          
Related Party Transaction [Line Items]          
Selling, general and administrative expenses $ 0.3 $ 0.7 $ 1.0 $ 1.6