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Document and Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2019
Jan. 07, 2020
Mar. 31, 2019
Document And Entity Information      
Entity Registrant Name CEMTREX INC    
Entity Central Index Key 0001435064    
Document Type 10-K    
Document Period End Date Sep. 30, 2019    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
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 Flag true    
Entity Emerging Growth Company false    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 4,239,752
Entity Common Stock, Shares Outstanding   4,527,889  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019