v3.26.1
COVER - shares
shares in Millions
6 Months Ended
Jun. 30, 2026
Jul. 27, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-41704  
Entity Registrant Name FORTREA HOLDINGS INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 92-2796441  
Entity Address, Address Line One 8 Moore Drive  
Entity Address, City or Town Durham  
Entity Address, State or Province NC  
Entity Address, Postal Zip Code 27713  
City Area Code (877)  
Local Phone Number 495-0816  
Title of 12(b) Security Common Stock, $0.001 par value  
Trading Symbol FTRE  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   95.1
Amendment Flag false  
Entity Central Index Key 0001965040  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31