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Business Acquisitions (Details)
 3 Months Ended 12 Months Ended
Jun. 10, 2019
USD ($)
item
Aug. 01, 2020
USD ($)
Jul. 27, 2019
USD ($)
Jul. 28, 2018
USD ($)
Apr. 30, 2020
USD ($)
Feb. 26, 2020
USD ($)
Business Acquisitions            
Ownership interest acquired 100.00%          
Fair value of contingent consideration           $ 2,500,000
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Goodwill   $ 6,340,000     $ 6,340,000  
Fair value of consideration transferred:            
Period of goodwill deduction   15 years        
Supplemental Pro forma Information            
Amortization of Intangible Assets   $ 709,000 $ 552,000      
SG&A            
Business Acquisitions            
Business acquisitions gain         832,000  
Supplemental Pro forma Information            
Acquisition-related costs     341,000      
Pulse Aerospace, LLC            
Business Acquisitions            
Ownership interest acquired 100.00%          
Amount of cash less closing indebtedness and transaction costs $ 20,650,000          
Amount of retention to cover post closing indemnification claims 250,000          
Amount of holdback $ 1,250,000          
Number of months after closing holdback will be paid 18 months          
Number of research and development milestones | item 2          
Total milestone achievement $ 5,000,000          
Contingent consideration 1,703,000          
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Inventory 334,000          
Goodwill 6,340,000 $ 6,340,000     $ 6,340,000  
Other assets and liabilities assumed (614,000)          
Total net identified assets acquired 21,880,000          
Fair value of consideration transferred:            
Cash 18,677,000          
Holdback 1,250,000          
Retention $ 250,000          
Supplemental Pro forma Information            
Revenue     87,138,000 $ 79,313,000    
Net income attributable to AeroVironment     $ 17,393,000 $ 26,369,000    
Pulse Aerospace, LLC | Discount rate            
Business Acquisitions            
Measurement input 4.5          
Pulse Aerospace, LLC | Minimum            
Business Acquisitions            
Each milestone achievement $ 0          
Pulse Aerospace, LLC | Maximum            
Business Acquisitions            
Each milestone achievement 2,500,000          
Pulse Aerospace, LLC | Technology            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets 14,950,000          
Pulse Aerospace, LLC | In-process research and development            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets 550,000          
Pulse Aerospace, LLC | Non-compete agreements            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets $ 320,000