| Cover Page | Apr. 29, 2020 |
| Cover [Abstract] | |
| Entity Central Index Key | 0000029644 |
| Amendment Flag | false |
| Document Type | 8-K |
| Document Period End Date | Apr. 29, 2020 |
| Entity Registrant Name | DONALDSON COMPANY, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-7891 |
| Entity Tax Identification Number | 41-0222640 |
| Entity Address, Address Line One | 1400 West 94th Street |
| Entity Address, City or Town | Minneapolis |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55431 |
| City Area Code | 952 |
| Local Phone Number | 887-3131 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $5.00 par value |
| Trading Symbol | DCI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
