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Quarterly Results of Operations (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Jan. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Selected Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 135,223,000 | $ 61,891,000 | $ 83,271,000 | $ 86,911,000 | $ 87,930,000 | $ 75,322,000 | $ 72,979,000 | $ 78,043,000 | $ 367,296,000 | $ 314,274,000 | $ 268,424,000
Gross margin | 53,168,000 | 23,496,000 | 35,166,000 | 41,272,000 | 37,023,000 | 30,392,000 | 28,399,000 | 32,589,000 | $ 153,102,000 | $ 128,403,000 | $ 107,685,000
Net (loss) income from attributable to AeroVironment from continuing operations | $ 17,736,000 | $ (1,008,000) | $ 7,501,000 | $ 17,110,000 | $ 6,097,000 | $ 8,431,000 | $ 7,047,000 | $ 20,337,000 |  |  |
Net (loss) income per share attributable to AeroVironment from continuing operations-basic | $ 0.74 | $ (0.04) | $ 0.32 | $ 0.72 | $ 0.26 | $ 0.35 | $ 0.30 | $ 0.86 | $ 1.74 | $ 1.77 | $ 0.93
Net (loss) income per share attributable to AeroVironment from continuing operations-diluted | $ 0.73 | $ (0.04) | $ 0.31 | $ 0.71 | $ 0.26 | $ 0.35 | $ 0.29 | $ 0.85 | $ 1.72 | $ 1.74 | $ 0.91
Number of weeks |  |  |  |  |  |  |  |  | 91 days |  |
Impairment of intangible assets and goodwill |  |  |  |  |  |  |  |  |  |  | $ 1,021,000
Deferred tax expense |  |  |  |  |  |  |  |  |  |  | $ 3,300,000

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