{"cik":807863,"taxonomy":"us-gaap","tag":"LongTermDebt","label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","entityName":"MITEK SYSTEMS, INC.","units":{"USD":[{"end":"2024-09-30","val":2697000,"accn":"0000807863-24-000142","fy":2024,"fp":"FY","form":"10-K","filed":"2024-12-16","frame":"CY2024Q3I"},{"end":"2025-09-30","val":4335000,"accn":"0001628280-25-056520","fy":2025,"fp":"FY","form":"10-K","filed":"2025-12-11"},{"end":"2025-09-30","val":152216000,"accn":"0000807863-26-000026","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-05-07"},{"end":"2025-09-30","val":152216000,"accn":"0000807863-26-000036","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-08-06","frame":"CY2025Q3I"},{"end":"2025-12-31","val":4777000,"accn":"0001628280-26-005783","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-02-05","frame":"CY2025Q4I"},{"end":"2026-03-31","val":50000000,"accn":"0000807863-26-000026","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-05-07","frame":"CY2026Q1I"},{"end":"2026-06-30","val":49375000,"accn":"0000807863-26-000036","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-08-06","frame":"CY2026Q2I"}]}}