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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 |  |

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