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Cover - USD ($)
 12 Months Ended
Sep. 30, 2025
Dec. 22, 2025
Mar. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Sep. 30, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
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     $ 2,623,509
Entity Common Stock, Shares Outstanding   6,911,663  
Document Financial Statement Error Correction [Flag] false    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of Cemtrex, Inc. and Subsidiaries (the “Company”) as of September 30, 2025 and 2024, and the related statements of operations, comprehensive loss, stockholders’ equity, and cash flows for each of the years in the two-year period ended September 30, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of September 30, 2025 and 2024, and the results of its operations and its cash flows for each of the years in the two-year period ended September 30, 2025, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name GRASSI & Co., CPAs, P.C.    
Auditor Location Jericho, New York    
Auditor Firm ID 606