| Cover | Dec. 15, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 15, 2021 |
| Entity Registrant Name | BRIGHAM MINERALS, INC. |
| Entity Central Index Key | 0001745797 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38870 |
| Entity Tax Identification Number | 83-1106283 |
| Entity Address, Address Line One | 5914 W. Courtyard Drive, |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Austin, |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78730 |
| City Area Code | (512) |
| Local Phone Number | 220-6350 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.01 |
| Trading Symbol | MNRL |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
