| Cover | Feb. 09, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 9, 2022 |
| Entity File Number | 0-31157 |
| Entity Registrant Name | INNOVATIVE SOLUTIONS AND SUPPORT, INC. |
| Entity Central Index Key | 0000836690 |
| Entity Tax Identification Number | 23-2507402 |
| Entity Incorporation, State or Country Code | PA |
| Entity Address, Address Line One | 720 Pennsylvania Drive |
| Entity Address, City or Town | Exton |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19341 |
| City Area Code | 610 |
| Local Phone Number | 646-9800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | ISSC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
