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Discontinued Operations and Disposal Groups (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 10, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Payment of merger consideration       $ 550.4
Disposal Group, Including Discontinued Operation, Revenue       541.9
Disposal Group, Including Discontinued Operation, Costs of Goods Sold       390.3
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)       151.6
Disposal Group, Including Discontinued Operation, General and Administrative Expense       68.5
Disposal Group, Including Discontinued Operation, Amortization of intangible assets       8.7
Disposal Group, Including Discontinued Operation, Operating Income (Loss)       74.4
Disposal Group, Including Discontinued Operation, Interest Expense       13.1
Disposal Group, Including Discontinued Operation, Loss on extinguishment and refinancing of debt, net       17.6
Earnings from Discontinued Operations before Income Taxes       43.7
Disposal Group, Including Discontinued Operation, Income tax expense       10.3
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest       33.4
Net earnings attributable to noncontrolling interest from discontinued operations   $ 0.0 $ 0.0 11.8
Net earnings from discontinued operations, net of tax and noncontrolling interest   $ 0.0 0.0 21.6
Other assets of discontinued operations $ 633.0      
Other liabilities of discontinued operations 1,064.6      
Disposal Group, Including Discontinued Operation, Net Assets (431.6)      
Additional Paid-in Capital        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
BellRing Spin-Off 442.5     442.5
Foreign Currency Translation Adjustments        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
BellRing Spin-Off $ 2.3     2.3
BellRing Brands, Inc. | BellRing Common Stock        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Par value of common stock $ 0.01      
Post        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Separation Costs     $ 0.1 29.9
BellRing | 7.00% Senior Notes due 2030 | Senior Notes        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Long-Term Debt, Gross       $ 840.0
Post shareholders | BellRing Common Stock        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Conversion of Stock, Shares Received 1.267788      
Post | BellRing        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent 14.20%      
Post | New BellRing Common Stock        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Distribution of ownership in subsidiary, shares 78,100,000      
Distribution of ownership in subsidiary, percentage 80.10%