{"cik":836690,"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":"INNOVATIVE SOLUTIONS AND SUPPORT, INC.","units":{"USD":[{"end":"2025-09-30","val":24375000,"accn":"0001104659-25-123847","fy":2025,"fp":"FY","form":"10-K","filed":"2025-12-23","frame":"CY2025Q3I"},{"end":"2025-12-31","val":23750000,"accn":"0001104659-26-015306","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-02-13","frame":"CY2025Q4I"},{"end":"2026-03-31","val":55125000,"accn":"0001104659-26-062716","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-05-15","frame":"CY2026Q1I"},{"end":"2026-06-30","val":54500000,"accn":"0001104659-26-095962","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-08-13","frame":"CY2026Q2I"}]}}