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Cover Page - USD ($)
 12 Months Ended
Sep. 30, 2020
Nov. 30, 2020
Mar. 31, 2020
Cover [Abstract]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Sep. 30, 2020    
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 600 B Street, Suite 100    
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 Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Entity Public Float     $ 317,317,789
Entity Common Stock, Shares Outstanding   42,522,293  
Documents Incorporated by Reference Portions of the registrant’s definitive proxy statement for the 2021 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission pursuant to Regulation 14A are incorporated by reference into Part III of this Form 10-K to the extent stated herein.    
Amendment Flag true    
Amendment Description Mitek Systems, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend its Annual Report on Form 10-K for the year ended September 30, 2020, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on December 7, 2020 (the “Original Filing”), solely to amend the Exhibits contained in Item 15(a)(3) of Part IV of the Original Filing to include Exhibit 10.28, Mitek Systems, Inc. Directors Deferral Plan, which was inadvertently omitted in the Original Filing and to specifically identify those exhibits which are management contracts, compensatory plans or arrangements.This Amendment is an exhibit-only filing. Except as described above, no changes have been made to the Original Filing and this Amendment does not modify, amend, or update in any way any of the financial or other information contained in the Original Filing. This Amendment does not reflect events that may have occurred subsequent to December 7, 2020. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings with the SEC. Pursuant to Rule 12b-15 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), currently dated certifications are filed herewith as exhibits to this Amendment pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act under Item 15 of Part IV hereof. Because no financial statements have been included in this Amendment and this Amendment does not contain any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. Similarly, because no financial statements have been included in this Amendment, certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 have been omitted.    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000807863    
Current Fiscal Year End Date --09-30