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Document and Entity Information
Mar. 01, 2022
Cover [Abstract]  
Entity Address, State or Province MO
Amendment Flag false
Entity Central Index Key 0001530950
Document Type 8-K
Document Period End Date Mar. 01, 2022
Entity Registrant Name Post Holdings, Inc.
Entity Incorporation State Country Code MO
Entity File Number 001-35305
Entity Tax Identification Number 45-3355106
Entity Address, Address Line One 2503 S. Hanley Road
Entity Address, City or Town St. Louis
Entity Address, Postal Zip Code 63144
City Area Code (314)
Local Phone Number 644-7600
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.01 par value per share
Trading Symbol POST
Security Exchange Name NYSE
Entity Emerging Growth Company false