v3.25.4
WBX East Africa and Alpen (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Sep. 30, 2025
Alpen Food Company South Africa (Pty) Limited    
Schedule of Related Party Transactions    
Equity Method Investment, Ownership Percentage 50.00%  
Alpen Food Company South Africa (Pty) Limited | Equity Method Investments    
Schedule of Related Party Transactions    
Equity method investments $ 5.1 $ 4.5
Post Holdings, Inc. | Weetabix East Africa Limited    
Schedule of Related Party Transactions    
Noncontrolling Interest, Ownership Percentage by Parent 50.20%