| Cover | Aug. 12, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 12, 2021 |
| Entity Registrant Name | UNIQUE FABRICATING, INC. |
| Entity File Number | 001-37480 |
| Entity Tax Identification Number | 46-1846791 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 800 Standard Parkway |
| Entity Address, Postal Zip Code | 48326 |
| Entity Address, State or Province | MI |
| Entity Address, City or Town | Auburn Hills, |
| Soliciting Material | false |
| Local Phone Number | 853-2333 |
| Title of 12(b) Security | Common stock, par value $.001 per share |
| Trading Symbol | UFAB |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| City Area Code | 248 |
| Entity Central Index Key | 0001617669 |
| Amendment Flag | false |
