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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2023
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, 2022258,987$17.74 
Granted—— 
Exercised—— 
Forfeited—— 
Expired—— 
Outstanding at September 30, 2023258,98717.74 6.80$6.1 
Vested and expected to vest as of September 30, 2023258,98717.74 6.806.1 
Exercisable at September 30, 2023195,56217.67 6.694.6 
Stock options, valuation assumptions The weighted-average assumptions and fair values for stock options granted during the year ended September 30, 2021 are summarized in the table below. There were no stock options granted during the years ended September 30, 2023 or 2022.
Expected term (in years)6.5
Expected stock price volatility38.5%
Risk-free interest rate0.6%
Expected dividends—%
Fair value (per option)$7.79
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, 2022579,969 $21.23 
Granted207,224 26.10 
Vested(302,887)20.09 
Forfeited(19,075)23.13 
Nonvested at September 30, 2023465,231 24.06 
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, 2022375,219 $41.44 
Granted176,062 45.26 
Vested— — 
Forfeited— — 
Nonvested at September 30, 2023551,281 42.66 
Schedule of Share-based Payment award, Non-Options, Valuation Assumptions
20232022
Expected term (in years)3.02.9
Expected stock price volatility46.8%49.6%
Risk-free interest rate4.1%2.3%
Expected dividends—%—%
Fair value (per PRSU)
$45.26$42.33