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Business Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 01, 2017
Apr. 30, 2017
Apr. 30, 2017
Apr. 30, 2016
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date        
Goodwill   $ 122 $ 122  
Altoy        
Business Acquisitions        
Ownership interest acquired 36.00%      
Ownership percentage 49.00%      
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date        
Goodwill $ 122      
Deferred tax liabilities (332)      
Other assets and liabilities assumed 286      
Total net identified assets acquired 1,736      
Fair value of consideration transferred:        
Cash 625      
Fair value of the Company's investment in Altoy prior to the acquisition 851      
Fair value of the noncontrolling interest in Altoy 260      
Total 1,736      
Supplemental Pro forma Information        
Revenue   0 265,220 $ 264,301
Net income (loss)   $ 122 11,654 9,168
Net income attributable to AeroVironment     11,734 $ 9,239
Altoy | Other income        
Fair value of consideration transferred:        
Gain recognized 584      
Altoy | SG&A        
Supplemental Pro forma Information        
Acquisition-related costs     $ 74  
Altoy | Customer relationships        
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date        
Intangible assets 1,600      
Altoy | Trademark and trade names        
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date        
Intangible assets $ 60