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Pay vs Performance Disclosure
 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Summary Compensation
Table Total
Compensation
Actually Paid
Value of Initial Fixed
$100 Investment Based
On:(4)
Year
for Current
PEO ($)(1)
for Interim
PEO ($)(1)
to Current
PEO ($)(1)(2)(3)
to Interim
PEO ($)(1)(2)(3)
Average
Summary
Compensation
Table Total for
Non-PEO
NEOs ($)(1)
Average
Compensation
Actually Paid
to Non-PEO
NEOs ($)(1)(2)(3)
TSR ($)
Peer Group
TSR ($)
Net Income
($ in millions)
Adjusted EBITDA
($ in billions)(5)
2025
16,621,445—14,967,589—7,134,7026,462,945183.25107.00335.71.519
2024
21,963,6756,978,11044,585,89914,455,2625,814,85112,307,458197.35126.32366.71.404
2023
17,359,796—20,678,622—5,457,9186,165,965146.18113.94301.31.233
2022
15,475,418—19,312,412—4,470,5155,922,265139.65111.28756.60.964
2021
14,288,491—23,608,658—6,128,2338,539,535128.09105.62166.71.123
        
Company Selected Measure Name Adjusted EBITDA        
Named Executive Officers, Footnote Robert V. Vitale is our current principal executive officer (“PEO”) and was our PEO for the entirety of each fiscal year presented except for fiscal year 2024, during which he took a medical leave of absence from November 2, 2023 through January 30, 2024. During Mr. Vitale’s medical leave of absence in fiscal year 2024, Jeff A. Zadoks served as our interim PEO. The individuals comprising the Non-PEO NEOs for each fiscal year presented are listed below.
20212022202320242025
Jeff A. Zadoks
Jeff A. Zadoks
Matthew J. Mainer
Matthew J. Mainer
Matthew J. Mainer
Howard A. Friedman
Nicolas Catoggio
Jeff A. Zadoks
Nicolas Catoggio
Nicolas Catoggio
Diedre J. Gray
Diedre J. Gray
Nicolas Catoggio
Diedre J. Gray
Diedre J. Gray
Mark W. Westphal
Mark W. Westphal
Diedre J. Gray
Mark W. Westphal
Jeff A. Zadoks
Mark W. Westphal
        
Peer Group Issuers, Footnote The Peer Group TSR set forth in this table utilizes the S&P 1500 Packaged Foods & Meats Index, which we also utilize in the stock performance graph required by Item 201(e) of Regulation S-K included in our Annual Report on Form 10-K for the year ended September 30, 2025, filed with the SEC on November 21, 2025. The comparison assumes $100 was invested for the period starting September 30, 2020 through the end of the listed year in Post common stock (with reinvestment of shares of BellRing common stock distributed to Post shareholders on March 10, 2022) and in the S&P 1500 Packaged Foods & Meats Index, respectively. Historical stock performance is not necessarily indicative of future stock performance.        
Adjustment To PEO Compensation, Footnote
Year
Summary
Compensation
Table Total for
Current PEO ($)
Exclusion of Change in
Pension Value for Current PEO ($)
Exclusion of Stock Awards
for Current PEO ($)
Inclusion of Pension Service Cost for Current PEO ($)
Inclusion of
Equity Values for
Current PEO ($)
Compensation Actually Paid to Current PEO ($)
202516,621,445(261,532)(14,811,295)129,98413,288,98714,967,589
        
Non-PEO NEO Average Total Compensation Amount $ 7,134,702        
Non-PEO NEO Average Compensation Actually Paid Amount $ 6,462,945        
Adjustment to Non-PEO NEO Compensation Footnote
Year
Average Summary
Compensation Table
Total for
Non-PEO NEOs ($)
Average Exclusion of Change in
Pension Value for
Non-PEO NEOs ($)
Average Exclusion of Stock
Awards for
Non-PEO NEOs ($)
Average Inclusion of Pension
Service Cost for
Non-PEO NEOs ($)
Average Inclusion
of Equity Values for
Non-PEO NEOs ($)
Average Compensation
Actually Paid to
Non-PEO NEOs ($)
20257,134,702(83,049)(6,175,888)39,1575,548,0236,462,945
        
Equity Valuation Assumption Difference, Footnote
The amounts in the Inclusion of Equity Values columns in the tables above are derived from the amounts set forth in the following tables:

Year
Year-End
Fair Value
of Equity
Awards
Granted During
Year that
Remained
Unvested as of
Last Day of
Year for
Current PEO
($)
Change in Fair
Value from Last
Day of Prior
Year to Last
Day of Year of
Unvested
Equity Awards
for
Current PEO
($)
Vesting
Date Fair Value
of Equity
Awards
Granted During
Year that
Vested During
Year for
Current PEO ($)
Change in Fair
Value from Last
Day of Prior
Year to Vesting
Date of
Unvested
Equity Awards
that Vested
During Year for
Current PEO ($)
Fair
Value at Last
Day of Prior
Year of Equity
Awards
Forfeited
During Year for
Current PEO ($)
Value
of Dividends or
Other Earnings
Paid on Equity
Awards Not
Otherwise
Included for
Current PEO ($)
Total -
Inclusion of
Equity Values
for
Current PEO ($)
202515,498,423(675,890)—(1,533,546)——13,288,987

Year
Average Year-End Fair Value of Equity Awards Granted During Year that Remained Unvested as of Last Day of Year for Non-PEO NEOs
($)
Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs
($)
Average Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year for Non-PEO NEOs
($)
Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs
($)
Average Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year for Non-PEO NEOs
($)
Average Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Included for Non-PEO NEOs
($)
Total - Average Inclusion of
Equity Values for Non-PEO NEOs
($)
20256,180,686(219,275)—(413,388)——5,548,023
        
Compensation Actually Paid vs. Total Shareholder Return
The following graph compares the Compensation Actually Paid to our current PEO, the Compensation Actually Paid to our former interim PEO, the average of the Compensation Actually Paid to our remaining NEOs, our cumulative TSR and the cumulative TSR of the S&P 1500 Packaged Foods & Meats Index over the five most recently completed fiscal years. The graph assumes a hypothetical investment of $100 on September 30, 2020 in each of Post common stock (with reinvestment of shares of BellRing common stock distributed to Post shareholders on March 10, 2022) and the S&P 1500 Packaged Foods & Meats Index.
Post Holdings TSR & S&P 1500 Packaged Foods & Meats Index TSR vs. Compensation Actually Paid
Graph - CAP v TSR.gif
        
Compensation Actually Paid vs. Net Income
The following graph compares the Compensation Actually Paid to our current PEO, the Compensation Actually Paid to our former interim PEO and the average of the Compensation Actually Paid to our remaining NEOs with our net income during the five most recently completed fiscal years. Although required to be disclosed by SEC rules, net income is not a metric in our executive compensation program.
Post Holdings Net Income vs. Compensation Actually Paid
Graph - CAP v Net Income.gif
        
Compensation Actually Paid vs. Company Selected Measure
The following graph compares the Compensation Actually Paid to our current PEO, the Compensation Actually Paid to our former interim PEO and the average of the Compensation Actually Paid to our remaining NEOs with our Company-selected financial performance measure, Adjusted EBITDA, during the five most recently completed fiscal years.
Post Holdings Adjusted EBITDA (our Company-Selected Financial Performance Measure) vs. Compensation Actually Paid
Graph - CAP v CSM.gif
        
Total Shareholder Return Amount $ 183.25 $ 197.35 $ 146.18 $ 139.65 $ 128.09
Peer Group Total Shareholder Return Amount 107.00 126.32 113.94 111.28 105.62
Net Income (Loss) $ 335.7 $ 366.7 $ 301.3 $ 756.6 $ 166.7
Company Selected Measure Amount 1.519 1.404 1.233 0.964 1.123
Additional 402(v) Disclosure The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table Total with certain adjustments as described in footnote 3 below.        
Measure:: 1          
Pay vs Performance Disclosure          
Name Adjusted EBITDA        
Measure:: 2          
Pay vs Performance Disclosure          
Name Segment Adjusted EBITDA - Post Consumer Brands        
Measure:: 3          
Pay vs Performance Disclosure          
Name Relative Total Shareholder Return Percentile Rank (as compared to the Russell 3000 Packaged Foods & Meats companies)        
PEO [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount $ 16,621,445 $ 21,963,675 $ 17,359,796 $ 15,475,418 $ 14,288,491
PEO Actually Paid Compensation Amount $ 14,967,589 44,585,899 20,678,622 19,312,412 23,608,658
PEO Name Robert V. Vitale        
PEO [Member] | Exclusion of Changes in Pension Value for PEO member [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (261,532)        
PEO [Member] | Exclusion of Stock Awards for PEO member [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (14,811,295)        
PEO [Member] | Inclusion of Pension Service Cost for PEO member [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 129,984        
PEO [Member] | Inclusion of Stock Award for PEO member [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 13,288,987        
PEO [Member] | Year-End Fair Value of Equity Awards Granted During Year that Remained Unvested as of Last Day of Year for PEO [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 15,498,423        
PEO [Member] | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for PEO [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (675,890)        
PEO [Member] | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for PEO [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (1,533,546)        
PEO [Member] | Total Inclusion of Equity Values for PEO member [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 13,288,987        
Interim PEO [Member]          
Pay vs Performance Disclosure          
PEO Total Compensation Amount 0 6,978,110 0 0 0
PEO Actually Paid Compensation Amount 0 $ 14,455,262 0 0 0
PEO Name   Jeff A. Zadoks      
Non-PEO NEO [Member]          
Pay vs Performance Disclosure          
Non-PEO NEO Average Total Compensation Amount 7,134,702 $ 5,814,851 5,457,918 4,470,515 6,128,233
Non-PEO NEO Average Compensation Actually Paid Amount 6,462,945 $ 12,307,458 $ 6,165,965 $ 5,922,265 $ 8,539,535
Non-PEO NEO [Member] | Average Exclusion of Changes in Pension Value for Non PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (83,049)        
Non-PEO NEO [Member] | Average Exclusion of Stock Awards for Non PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (6,175,888)        
Non-PEO NEO [Member] | Average Inclusion of Pension Service Cost for Non PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 39,157        
Non-PEO NEO [Member] | Average Inclusion of Equity Values for Non PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 5,548,023        
Non-PEO NEO [Member] | Average Year-End Fair Value of Equity Awards Granted During Year that Remained Unvested as of Last Day of Year for Non-PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 6,180,686        
Non-PEO NEO [Member] | Average Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards for Non-PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (219,275)        
Non-PEO NEO [Member] | Average Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year for Non-PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (413,388)        
Non-PEO NEO [Member] | Total Average Inclusion of Equity Values for Non-PEO NEOs [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 5,548,023