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v3.25.3

Stock-Based Compensation (Tables) | 12 Months Ended
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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, 2024 | 258,987 |  | $ | 17.74 |  |  |  |  |
Granted | — |  | — |  |  |  |  |
Exercised | (11,000) |  | 17.30 |  |  |  |  |
Forfeited | — |  | — |  |  |  |  |
Expired | — |  | — |  |  |  |  |
Outstanding at September 30, 2025 | 247,987 |  | 17.76 |  |  | 4.83 |  | $ | 4.6 |
Vested and expected to vest as of September 30, 2025 | 247,987 |  | 17.76 |  |  | 4.83 |  | 4.6 |
Exercisable at September 30, 2025 | 247,987 |  | 17.76 |  |  | 4.83 |  | 4.6 |
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, 2024 | 433,260 |  |  | $ | 36.63 |
Granted | 132,824 |  |  | 69.67 |
Vested | (198,417) |  |  | 31.04 |
Forfeited | (17,972) |  |  | 39.77 |
Nonvested at September 30, 2025 | 349,695 |  |  | 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, 2024 | 773,194 |  |  | $ | 53.79 |
Granted | 85,818 |  |  | 129.89 |
Adjustment for performance achievement (a) | 600,351 |  |  | n/a
Vested | (975,570) |  |  | 41.44 |
Forfeited | — |  |  | — |
Nonvested at September 30, 2025 | 483,793 |  |  | 77.47 |
(a)Represents the adjustment to previously granted PRSUs for performance achievement.
Schedule of Share-based Payment award, Non-Options, Valuation Assumptions |
| 2025 |  | 2024 |  | 2023
Expected term | 3 years |  | 3 years |  | 3 years
Expected stock price volatility | 36.5% |  | 39.4% |  | 46.8%
Risk-free interest rate | 4.1% |  | 4.7% |  | 4.1%
Expected dividends | —% |  | —% |  | —%
Fair value (per PRSU) | $129.89 |  | $81.42 |  | $45.26

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding performance-based awards that are fully vested and expected to vest. Includes, but is not limited to, unvested awards for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (e)(1) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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