Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2019
Jun. 19, 2019
Oct. 28, 2018
Document and Entity Information      
Entity Registrant Name AeroVironment Inc    
Entity Central Index Key 0001368622    
Document Type 10-K    
Document Period End Date Apr. 30, 2019    
Amendment Flag false    
Current Fiscal Year End Date --04-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,893.7
Entity Common Stock, Shares Outstanding   23,942,558  
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Small Business false