| Document And Entity Information | Jul. 07, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Jul. 7, 2021 |
| Entity Registrant Name | WD-40 COMPANY |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-06936 |
| Entity Tax Identification Number | 95-1797918 |
| Entity Address, Address Line One | 9715 Businesspark Avenue |
| Entity Address, City or Town | San Diego |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92131 |
| City Area Code | 619 |
| Local Phone Number | 275-1400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.001 per share |
| Trading Symbol | WDFC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000105132 |
| Amendment Flag | false |
