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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 |  |

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