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Stockholders' Equity (Details) - Common Stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Class of Stock [Line Items] |  |  |
Purchases of treasury stock, shares | (9.0) | (2.6) | (4.2)
Payments for Other Taxes | $ 2.2 |  |
BellRing Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Purchases of treasury stock, shares | 9.0 | 2.6 | 4.2
Treasury Stock Acquired, Average Cost Per Share | $ 52.62 | $ 56.12 | $ 29.56
Payments for Repurchase of Common Stock | $ 476.6 | $ 148.0 | $ 126.3
Sales and Excise Tax Payable, Current | $ 3.9 | $ 1.4 | $ 0.8

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