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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Nov. 30, 2017
Mar. 31, 2017
Document and Entity Information      
Entity Registrant Name INNOVATIVE SOLUTIONS & SUPPORT INC    
Entity Central Index Key 0000836690    
Document Type 10-K    
Document Period End Date Sep. 30, 2017    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 38.4
Entity Common Stock, Shares Outstanding   16,783,129  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY