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Organization and Significant Accounting Policies - Research and Development (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Stock-Based Compensation      
Performance period 3 years    
Research and Development      
Revenue from customer funded research and development $ 74,218 $ 80,934 $ 76,407
Cost of sales 51,395 56,440 54,824
Research and Development With Federal Government      
Funding 11,225    
Reimbursement amount 21,833    
Reimbursements under the contract $ 3,424 8,102 5,936
Lease Accounting      
Option to terminate period (in years) 2 years    
Advertising Costs      
Advertising expenses $ 675 934 897
Foreign currency transactions      
Foreign currency losses 1 1 38
Numerator for basic earnings per share:      
Continuing operations attributable to AeroVironment 23,331 41,339 41,912
Discontinued operations, net of tax   (265) 5,526
Net income attributable to AeroVironment $ 23,331 $ 41,074 $ 47,438
Denominator for basic earnings per share:      
Weighted average common shares 24,049,851 23,806,208 23,663,410
Dilutive effect of employee stock options, restricted stock and restricted stock units 312,805 281,959 408,303
Denominator for diluted earnings per share 24,362,656 24,088,167 24,071,713
Number of shares reserved for issuance that are anti-dilutive 3,000 3,000 18,000
Prepaid expenses and other current assets      
Cost to Fulfill a Contract with a Customer      
Costs to fulfill future performance obligations $ 1,729 $ 0  
Minimum      
Lease Accounting      
Remaining lease terms (in years) 1 year    
Maximum      
Lease Accounting      
Remaining lease terms (in years) 9 years    
Option to extend period (in years) 10 years