Stock-Based Compensation Plans (Tables)
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12 Months Ended |
Sep. 30, 2024 |
| Post Stock Settled |
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| Share-based Payment Award [Line Items] |
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| Stock Appreciation Rights, Activity |
| | | | | | | | | | | | | | | | | | | | | | | | $ in millions, except price per share | SARs | | Weighted- Average Exercise Price Per Share | | Weighted- Average Remaining Contractual Term in Years | | Aggregate Intrinsic Value | | Outstanding at September 30, 2023 | 51,898 | | | $ | 36.35 | | | | | | | Granted | — | | | | | | | | | | | | | | | | | Exercised | (22,242) | | | 34.79 | | | | | | | Forfeited | — | | | | | | | | | Expired | — | | | | | | | | | Outstanding at September 30, 2024 | 29,656 | | | 37.53 | | | 0.63 | | $ | 2.3 | | | Vested and expected to vest as of September 30, 2024 | 29,656 | | | 37.53 | | | 0.63 | | 2.3 | | | Exercisable at September 30, 2024 | 29,656 | | | 37.53 | | | 0.63 | | 2.3 | |
Upon exercise of each SAR, the holder will receive the number of shares of Post common stock equal in value to the difference between the exercise price and the fair market value at the date of exercise, less all applicable taxes. The total intrinsic value of SARs exercised was $1.4, $1.9 and $3.0 during the years ended September 30, 2024, 2023 and 2022, respectively. There were no SARs granted during the years ended September 30, 2024, 2023 or 2022.
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| Restricted Stock Units, Activity |
| | | | | | | | | | | | | RSUs | | Weighted- Average Grant Date Fair Value Per Share | | Nonvested at September 30, 2023 | 1,060,232 | | | $ | 79.99 | | | Granted | 545,106 | | | 86.30 | | | | | | | Vested | (564,416) | | | 76.13 | | | Forfeited | (46,588) | | | 84.99 | | | Nonvested at September 30, 2024 | 994,334 | | | 85.41 | |
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| Post Stock Options |
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| Share-based Payment Award [Line Items] |
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| Stock Options, Activity |
| | | | | | | | | | | | | | | | | | | | | | | | $ in millions, except price per share | Stock Options | | Weighted- Average Exercise Price Per Share | | Weighted- Average Remaining Contractual Term in Years | | Aggregate Intrinsic Value | | Outstanding at September 30, 2023 | 748,708 | | | $ | 51.96 | | | | | | | Granted | — | | | — | | | | | | | | | | | | | | | Exercised | (397,627) | | | 46.64 | | | | | | | Forfeited | — | | | — | | | | | | | Expired | — | | | — | | | | | | | Outstanding at September 30, 2024 | 351,081 | | | 57.99 | | | 3.61 | | $ | 20.3 | | | Vested and expected to vest as of September 30, 2024 | 351,081 | | | 57.99 | | | 3.61 | | 20.3 | | | Exercisable at September 30, 2024 | 351,081 | | | 57.99 | | | 3.61 | | 20.3 | |
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| Post Cash Settled |
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| Share-based Payment Award [Line Items] |
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| Restricted Stock Units, Activity |
| | | | | | | | | | | | | Cash RSUs | | Weighted- Average Grant Date Fair Value Per Share | | Nonvested at September 30, 2023 | 13,048 | | | $ | 34.68 | | | Granted | 1,910 | | | 106.28 | | | | | | | Vested | (13,048) | | | 34.68 | | | Forfeited | — | | | — | | | Nonvested at September 30, 2024 | 1,910 | | | 106.28 | |
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| Earnings-Based Restricted Stock Units |
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| Share-based Payment Award [Line Items] |
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| Performance-Based Restricted Stock Units |
| | | | | | | | | | | | | Earnings PRSUs | | Weighted- Average Grant Date Fair Value Per Share | | Nonvested at September 30, 2023 | 259,542 | | | $ | 83.20 | | | Granted | 170,077 | | | 85.53 | | | | | | | | | | | Vested | (191,131) | | | 80.09 | | | Forfeited | (7,022) | | | 87.24 | | | Nonvested at September 30, 2024 | 231,466 | | | 87.37 | |
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| Market-based performance shares |
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| Share-based Payment Award [Line Items] |
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| Performance-Based Restricted Stock Units |
| | | | | | | | | | | | | Market PRSUs | | Weighted- Average Grant Date Fair Value Per Share | | Nonvested at September 30, 2023 | 494,105 | | | $ | 120.69 | | | Granted | 154,904 | | | 143.63 | | Adjustment for performance achievement (a) | 201,886 | | | n/a | | | | | | Vested | (392,344) | | | 102.90 | | | Forfeited | — | | | — | | | Nonvested at September 30, 2024 | 458,551 | | | 135.83 | |
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| Performance RSU, Valuation Assumptions |
| | | | | | | | | | | | | | | | | | | 2024 | | 2023 | | 2022 | Expected term | 3 years | | 3 years | | 3 years | | | | | | | | | | | | | | Expected stock price volatility | 22.5% | | 29.1% | | 27.7% | | Risk-free interest rate | 4.5% | | 4.1% | | 0.9% | | Expected dividends | 0% | | 0% | | 0% | | | | | | | | | | | | | | | | | | | | | | | | | | Fair value (per Market PRSU) | $143.63 | | $156.05 | | $163.63 |
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