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Stock-Based Compensation Plans (Tables)

12 Months Ended

Sep. 30, 2024

Post Stock Settled

Share-based Payment Award [Line Items]

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.

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

Post Stock Options

Share-based Payment Award [Line Items]

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

Post Cash Settled

Share-based Payment Award [Line Items]

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

Earnings-Based Restricted Stock Units

Share-based Payment Award [Line Items]

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

Market-based performance shares

Share-based Payment Award [Line Items]

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

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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