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Organization and Significant Accounting Policies - Research and Development (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Research and Development      
Revenue from customer funded research and development $ 80,934 $ 76,407 $ 52,489
Cost of sales 56,440 54,824 36,855
Research and Development With Federal Government      
Funding 11,225    
Reimbursement amount 21,933    
Reimbursements under the contract $ 8,102 5,936 4,188
Lease Accounting      
Deferred rent liabilities   1,173 1,536
Option to extend period (in years) 10 years    
Option to terminate period (in years) 2 years    
Advertising Costs      
Advertising expenses $ 934 897 526
Foreign currency transactions      
Foreign currency gain (loss) (1) (38) 87
Numerator for basic earnings per share:      
Continuing operations attributable to AeroVironment 41,339 41,912 21,750
Discontinued operations, net of tax (265) 5,526 (3,887)
Net income attributable to AeroVironment $ 41,074 $ 47,438 $ 17,863
Denominator for basic (loss) earnings per share:      
Weighted average common shares 23,806,208 23,663,410 23,471,241
Dilutive effect of employee stock options, restricted stock and restricted stock units 281,959 408,303 342,531
Denominator for diluted (loss) earnings per share 24,088,167 24,071,713 23,813,772
Number of shares reserved for issuance that are anti-dilutive 3,000 18,000 22,000
Minimum      
Lease Accounting      
Remaining lease terms (in years) 1 year    
Maximum      
Lease Accounting      
Remaining lease terms (in years) 6 years    
Option to extend period (in years) 10 years