REVENUE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue
Net Sales	$ 598.7	$ 588.0	$ 1,136.0	$ 1,120.9
Shakes
Disaggregation of Revenue
Net Sales	498.7	487.5	931.1	927.0
Powders
Disaggregation of Revenue
Net Sales	84.2	88.0	176.3	169.2
Other
Disaggregation of Revenue
Net Sales	$ 15.8	$ 12.5	$ 28.6	$ 24.7