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Background	12 Months Ended
	Sep. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background	BACKGROUND Post is a consumer packaged goods holding company operating in the center-of-the-store, refrigerated, foodservice and food ingredient categories. The Company’s products are sold through a variety of channels, including grocery, club and drug stores, mass merchandisers, foodservice, food ingredient and eCommerce. As of September 30, 2024, Post operates in four reportable segments: Post Consumer Brands, Weetabix, Foodservice and Refrigerated Retail. The Post Consumer Brands segment includes primarily North American ready-to-eat (“RTE”) cereal, pet food and peanut butter; the Weetabix segment includes primarily United Kingdom (“U.K.”) RTE cereal, muesli and protein-based shakes; the Foodservice segment includes primarily egg and potato products; and the Refrigerated Retail segment includes primarily side dish, egg, cheese and sausage products. Unless otherwise stated or the context otherwise indicates, all references in these financial statements and notes to “Post,” “the Company,” “us,” “our” or “we” mean Post Holdings, Inc. and its subsidiaries. On March 10, 2022, the Company completed its distribution of 80.1% of its ownership interest in BellRing Brands, Inc. (formerly known as BellRing Distribution, LLC) (“BellRing”) to Post’s shareholders (the “BellRing Distribution,” and such transaction, as well as the BellRing Contribution, the BellRing Merger (as such terms are defined in Note 4), the Debt-for-Debt Exchange (as such term is defined in Note 17) and the related transactions described in Note 4, the “BellRing Spin-off”). The BellRing Spin-off represented a strategic shift that had a major effect on the Company’s operations and consolidated financial results. Accordingly, the historical results of BellRing Intermediate Holdings, Inc. (formerly known as BellRing Brands, Inc.) (“Old BellRing”) and BellRing Distribution, LLC prior to the BellRing Spin-off have been presented as discontinued operations in the Company’s Consolidated Statements of Operations and Consolidated Statements of Cash Flows. The Notes to Consolidated Financial Statements reflect continuing operations only, unless otherwise indicated. See Note 4 for additional information regarding the BellRing Spin-off and discontinued operations. Certain reclassifications have been made to previously reported financial information to conform to the Company’s current period presentation.

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- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480424/946-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480424/946-10-50-2

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-Topic 810
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/810/tableOfContent

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-Topic 205
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/205/tableOfContent

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