Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue
Net Sales	$ 430.4	$ 362.7
Shakes and other beverages
Disaggregation of Revenue
Net Sales	350.2	297.0
Powders
Disaggregation of Revenue
Net Sales	69.7	56.1
Other
Disaggregation of Revenue
Net Sales	$ 10.5	$ 9.6