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Document and Entity Information - shares
9 Months Ended
Jun. 30, 2024
Aug. 09, 2024
Cover    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
Document Transition Report false  
Entity File Number 001-41503  
Entity Registrant Name INNOVATIVE SOLUTIONS AND SUPPORT, INC.  
Entity Incorporation, State or Country Code PA  
Entity Tax Identification Number 23-2507402  
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  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol ISSC  
Security Exchange Name NASDAQ  
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  
Entity Common Stock, Shares Outstanding   17,499,955
Entity Central Index Key 0000836690  
Current Fiscal Year End Date --09-30  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3  
Amendment Flag false