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Business Acquisitions (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 01, 2017
Oct. 28, 2017
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Jan. 31, 2017
Business Acquisitions            
Ownership percentage           49.00%
Fair value of consideration transferred:            
Impairment charge       $ 899,000    
SG&A            
Fair value of consideration transferred:            
Impairment charge   $ 899,000        
Customer relationships            
Fair value of consideration transferred:            
Impairment charge       867,000    
Altoy            
Business Acquisitions            
Ownership interest acquired 36.00%          
Ownership percentage 85.00%         49.00%
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Goodwill $ 122,000          
Deferred tax liabilities (332,000)          
Other assets and liabilities assumed 286,000          
Total net identified assets acquired 1,736,000          
Fair value of consideration transferred:            
Cash 625,000          
Fair value of the Company's investment in Altoy prior to the acquisition 851,000          
Fair value of the noncontrolling interest in Altoy 260,000          
Total 1,736,000          
Supplemental Pro forma Information            
Revenue     $ 0 229,287,000 $ 233,941,000  
Net income (loss)     $ 122,000 15,808,000 15,595,000  
Net income attributable to AeroVironment       15,888,000 $ 15,666,000  
Altoy | Other income            
Fair value of consideration transferred:            
Gain recognized 584,000          
Altoy | SG&A            
Supplemental Pro forma Information            
Acquisition-related costs       $ 74,000    
Altoy | Customer relationships            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets 1,600,000          
Altoy | Trademark and trade names            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets $ 60,000