| Cover | Aug. 14, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Aug. 14, 2023 |
| Entity Registrant Name | Fortrea Holdings Inc. |
| City Area Code | 8 Moore Drive |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-41704 |
| Entity Tax Identification Number | 92-2796441 |
| Entity Address, City or Town | Durham, |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 27709 |
| City Area Code | 877 |
| Local Phone Number | 495-0816 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value |
| Trading Symbol | FTRE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001965040 |
| Amendment Flag | false |
