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Business Acquisitions (Details) |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 26, 2020 USD ($) | Jun. 10, 2018 USD ($) item | Feb. 01, 2017 USD ($) | Jan. 25, 2020 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($) | Jun. 10, 2019
Business Acquisitions |  |  |  |  |  |  |  |
Ownership interest acquired |  |  |  |  |  |  |  | 100.00%
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 6,340,000 |  |  |
Supplemental Pro forma Information |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  |  |  |  | 2,822,000 | $ 357,000 | $ 296,000 |
Altoy |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Amount of retention to cover post closing indemnification claims |  |  | $ 250,000 |  |  |  |  |
Amount of holdback |  |  | 1,250,000 |  |  |  |  |
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date |  |  |  |  |  |  |  |
Inventory |  |  | 334,000 |  |  |  |  |
Goodwill |  |  | 6,340,000 |  |  |  |  |
Other assets and liabilities assumed |  |  | (614,000) |  |  |  |  |
Total net identified assets acquired |  |  | 21,880,000 |  |  |  |  |
Fair value of consideration transferred: |  |  |  |  |  |  |  |
Cash |  |  | 18,677,000 |  |  |  |  |
Holdback |  |  | 1,250,000 |  |  |  |  |
Retention |  |  | 250,000 |  |  |  |  |
Contingent consideration |  |  | 1,703,000 |  |  |  |  |
Cash consideration received |  |  | 21,880,000 |  |  |  |  |
Supplemental Pro forma Information |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 367,523,000 | 316,878,000 |  |
Net income attributable to AeroVironment |  |  |  |  | 41,481,000 | $ 43,204,000 |  |
Altoy | In process research and development |  |  |  |  |  |  |  |
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date |  |  |  |  |  |  |  |
Intangible assets |  |  | 550,000 |  |  |  |  |
Altoy | Non-compete agreements |  |  |  |  |  |  |  |
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date |  |  |  |  |  |  |  |
Intangible assets |  |  | 320,000 |  |  |  |  |
Altoy | Customer relationships |  |  |  |  |  |  |  |
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 14,950,000 |  |  |  |  |
Pulse Aerospace, LLC |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Ownership interest acquired |  | 100.00% |  |  |  |  |  |
Amount of cash less closing indebtedness and transaction costs |  | $ 20,650,000 |  |  |  |  |  |
Amount of retention to cover post closing indemnification claims |  | 250,000 |  |  |  |  |  |
Amount of holdback |  | $ 1,250,000 |  |  |  |  |  |
Number of months after closing holdback will be paid |  | 18 months |  |  |  |  |  |
Number of research and development milestones | item |  | 2 |  |  |  |  |  |
Each milestone achievement | $ 2,500,000 |  |  |  |  |  |  |
Total milestone achievement |  | $ 5,000,000 |  |  |  |  |  |
Contingent consideration paid |  | 1,703,000 |  |  | 2,500,000 |  |  |
Fair value of consideration transferred: |  |  |  |  |  |  |  |
Holdback |  | 1,250,000 |  |  |  |  |  |
Retention |  | $ 250,000 |  |  |  |  |  |
Supplemental Pro forma Information |  |  |  |  |  |  |  |
Revenue |  |  |  |  | 6,607,000 |  |  |
Amortization of Intangible Assets |  |  |  |  | 2,461,000 |  |  |
Pulse Aerospace, LLC | Discount rate |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Measurement input |  | 4.5 |  |  |  |  |  |
Pulse Aerospace, LLC | SG&A |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Business acquisitions gain |  |  |  | $ 832,000 | $ 832,000 |  |  |
Pulse Aerospace, LLC | Minimum |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Each milestone achievement |  | $ 0 |  |  |  |  |  |
Pulse Aerospace, LLC | Maximum |  |  |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |  |  |
Each milestone achievement |  | $ 2,500,000 |  |  |  |  |  |
Fair value of consideration transferred: |  |  |  |  |  |  |  |
Cash |  |  |  | $ 5,000,000 |  |  |  |

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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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