v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 12, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Trading Symbol LMRI  
Entity Registrant Name Lumexa Imaging Holdings, Inc.  
Entity Central Index Key 0002071288  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity File Number 001-43010  
Entity Tax Identification Number 41-2605845  
Entity Address, Address Line One 4200 Six Forks Road  
Entity Address, Address Line Two Suite 1000  
Entity Address, City or Town Raleigh  
Entity Address, State or Province NC  
Entity Address, Postal Zip Code 27609  
City Area Code 919  
Local Phone Number 763-1100  
Entity Common Stock, Shares Outstanding   96,080,735
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Security Exchange Name NASDAQ