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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2024
BRBR Stock Options  
Share-based Payment Award [Line Items]  
Stock options, activity
in millions, except options or where otherwise indicated
Stock Options
Weighted-
Average
Exercise
Price Per
Share
Weighted-
Average
Remaining
Contractual
Term in Years		Aggregate
Intrinsic
Value
Outstanding at September 30, 2023258,987$17.74 
Granted—— 
Exercised—— 
Forfeited—— 
Expired—— 
Outstanding at September 30, 2024258,98717.74 5.80$11.1 
Vested and expected to vest as of September 30, 2024258,98717.74 5.8011.1 
Exercisable at September 30, 2024258,98717.74 5.8011.1 
Stock options, valuation assumptions There were no stock options granted during the years ended September 30, 2024, 2023 or 2022.
BRBR Stock-Settled Restricted Stock Units  
Share-based Payment Award [Line Items]  
Restricted stock units, activity
RSUs
Weighted-
Average
Grant Date Fair Value Per
 Share
Nonvested at September 30, 2023465,231 $24.06 
Granted232,060 47.00 
Vested(240,181)23.11 
Forfeited(23,850)28.53 
Nonvested at September 30, 2024433,260 36.63 
BRBR Performance-Based Restricted Stock Units  
Share-based Payment Award [Line Items]  
Share-Based Compensation Arrangements by Share-Based Payment Award, Performance-Based Units, Vested and Expected to Vest
PRSUs
Weighted-
Average
Grant Date Fair Value Per
 Share
Nonvested at September 30, 2023551,281 $42.66 
Granted221,913 81.42 
Vested— — 
Forfeited— — 
Nonvested at September 30, 2024773,194 53.79 
Schedule of Share-based Payment award, Non-Options, Valuation Assumptions
202420232022
Expected term
3 years3 years3 years
Expected stock price volatility39.4%46.8%49.6%
Risk-free interest rate4.7%4.1%2.3%
Expected dividends—%—%—%
Fair value (per PRSU)
$81.42$45.26$42.33