| Cover Page Document | Dec. 07, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Entity Registrant Name | OIL-DRI CORPORATION OF AMERICA |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-12622 |
| Entity Tax Identification Number | 36-2048898 |
| Entity Address, Address Line One | 410 North Michigan Avenue |
| Entity Address, Address Line Two | Suite 400 |
| Entity Address, City or Town | Chicago |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60611-4213 |
| City Area Code | 312 |
| Local Phone Number | 321-1515 |
| Title of 12(b) Security | Common Stock, par value $0.10 per share |
| Trading Symbol | ODC |
| Security Exchange Name | NYSE |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000074046 |
| Amendment Flag | false |
| Document Period End Date | Mar. 11, 2021 |
