Cover Page
| Cover Page | Sep. 30, 2024 | May 16, 2024 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | May 16, 2024 | |
| Entity Registrant Name | Compass Minerals International, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-31921 | |
| Entity Tax Identification Number | 36-3972986 | |
| Entity Address, Address Line One | 9900 West 109th Street | |
| Entity Address, Address Line Two | Suite 100 | |
| Entity Address, City or Town | Overland Park | |
| Entity Address, State or Province | KS | |
| Entity Address, Postal Zip Code | 66210 | |
| City Area Code | 913 | |
| Local Phone Number | 344-9200 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common stock, $0.01 par value | |
| Trading Symbol | CMP | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false | |
| Entity Central Index Key | 0001227654 | |
| Amendment Flag | false | |
| Current Fiscal Year End Date | --09-30 |