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Cover - USD ($)
 12 Months Ended
Sep. 30, 2025
Nov. 30, 2025
Mar. 31, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2025    
Current Fiscal Year End Date --09-30    
Document Transition Report false    
Entity File Number 001-35231    
Entity Registrant Name MITEK SYSTEMS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-0418827    
Entity Address, Address Line One 770 First Avenue, Suite 425    
Entity Address, City or Town San Diego,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92101    
City Area Code 619    
Local Phone Number 269-6800    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol MITK    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 350,011,167
Entity Common Stock, Shares Outstanding   45,742,350  
Documents Incorporated by Reference
Portions of the Registrant’s definitive proxy statement for its 2026 Annual Meeting of Stockholders (the “Proxy Statement”), to be filed within 120 days of the
Registrant’s fiscal year ended September 30, 2025, are incorporated by reference in Part III of this Annual Report on Form 10-K. Except with respect to information
specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000807863