v3.26.3
Cover - shares
 9 Months Ended
Sep. 30, 2026
Nov. 12, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity File Number 333-294940  
Entity Registrant Name RMX INDUSTRIES, INC.  
Entity Incorporation, State or Country Code NV  
Entity Tax Identification Number 88-2960484  
Entity Address, Address Line One 4514 Cole Ave  
Entity Address, Address Line Two Ste. 600  
Entity Address, City or Town Dallas  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 75205  
City Area Code (866)  
Local Phone Number 706-4276  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001970743  
Amendment Flag false  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   10,283,853
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   333,334