| Cover | Dec. 31, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 31, 2021 |
| Entity Registrant Name | a.k.a. Brands Holding Corp. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40828 |
| Entity Tax Identification Number | 87-0970919 |
| Entity Address, Address Line One | 100 Montgomery Street, Suite 1600 |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94104 |
| City Area Code | 415 |
| Local Phone Number | 295-6085 |
| 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 | AKA |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001865107 |
| Amendment Flag | false |
