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Cover - USD ($)
 12 Months Ended
Sep. 30, 2024
Dec. 23, 2024
Mar. 28, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Sep. 30, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --09-30    
Entity File Number 001-37464    
Entity Registrant Name CEMTREX, INC.    
Entity Central Index Key 0001435064    
Entity Tax Identification Number 30-0399914    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 135 Fell Ct    
Entity Address, City or Town Hauppauge    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 11788    
City Area Code 631    
Local Phone Number 756-9116    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol CETX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 4,249,917
Entity Common Stock, Shares Outstanding   1,724,162  
Document Financial Statement Error Correction [Flag] false    
Auditor Name Grassi & Co., CPAs, P.C.    
Auditor Location Jericho, New York    
Auditor Firm ID 606