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Background (Details) - $ / shares
Oct. 21, 2019
Sep. 30, 2021
Sep. 30, 2020
Common Class A      
Common stock, par value per share   $ 0.01 $ 0.01
Issuance of common stock, shares 39,400,000    
Voting power of common stock   33.00%  
Common stock, shares outstanding   39,510,430 39,428,571
Common Class B      
Common stock, par value per share $ 0.01 $ 0.01 $ 0.01
Voting power of common stock   67.00%  
Common stock, shares outstanding   1 1
BellRing Brands, LLC unit | BellRing Brands, Inc.      
Common unit, issued 39,400,000    
Noncontrolling interest, ownership percentage by parent   28.80% 28.80%
BellRing Brands, LLC unit | Post Holdings, Inc.      
Common unit, issued 97,500,000    
Noncontrolling interest, ownership percentage by noncontrolling owners   71.20% 71.20%
Common units, outstanding   97,500,000 97,500,000