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Stock-Based Compensation (Tables)
 12 Months Ended
Sep. 30, 2025
BRBR Stock Options  
Share-based Payment Award [Line Items]  
Stock options, activity
$ in millions, except per share
Stock Options
Weighted-
Average
Exercise
Price Per
Share
Weighted-
Average
Remaining
Contractual
Term in Years		Aggregate
Intrinsic
Value
Outstanding at September 30, 2024258,987$17.74 
Granted—— 
Exercised(11,000)17.30 
Forfeited—— 
Expired—— 
Outstanding at September 30, 2025247,98717.76 4.83$4.6 
Vested and expected to vest as of September 30, 2025247,98717.76 4.834.6 
Exercisable at September 30, 2025247,98717.76 4.834.6 
Stock options, valuation assumptions There were no stock options granted during the years ended September 30, 2025, 2024 or 2023.
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, 2024433,260 $36.63 
Granted132,824 69.67 
Vested(198,417)31.04 
Forfeited(17,972)39.77 
Nonvested at September 30, 2025349,695 42.48 
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, 2024773,194 $53.79 
Granted85,818 129.89 
Adjustment for performance achievement (a)
600,351 n/a
Vested(975,570)41.44 
Forfeited— — 
Nonvested at September 30, 2025483,793 77.47 
(a)Represents the adjustment to previously granted PRSUs for performance achievement.
Schedule of Share-based Payment award, Non-Options, Valuation Assumptions
202520242023
Expected term
3 years3 years3 years
Expected stock price volatility36.5%39.4%46.8%
Risk-free interest rate4.1%4.7%4.1%
Expected dividends—%—%—%
Fair value (per PRSU)
$129.89$81.42$45.26