| Cover | Apr. 08, 2024 | Aug. 31, 2023 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Entity Registrant Name | The Honest Company, Inc. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-40378 | |
| Entity Tax Identification Number | 90-0750205 | |
| Entity Address, Address Line One | 12130 Millennium Drive | |
| Entity Address, Address Line Two | #500 | |
| Entity Address, City or Town | Los Angeles | |
| Entity Address, State or Province | CA | |
| Entity Address, Postal Zip Code | 90094 | |
| City Area Code | 888 | |
| Local Phone Number | 862-8818 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share | |
| Trading Symbol | HNST | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | false | |
| Entity Central Index Key | 0001530979 | |
| Amendment Flag | false | |
| Document Period End Date | Apr. 08, 2024 |
