v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Sep. 30, 2012
Nov. 23, 2012
Mar. 30, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name MITEK SYSTEMS INC    
Entity Central Index Key 0000807863    
Document Type 10-K    
Document Period End Date Sep. 30, 2012    
Amendment Flag false    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 266,738,474
Entity Common Stock, Shares Outstanding   26,041,283