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Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Nov. 28, 2014
Mar. 31, 2014
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, 2014    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 79.6dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   16,957,642dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY