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Organization and Significant Accounting Policies - Government Contracts (Details) - USD ($)	3 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Apr. 30, 2019
Government Contracts
Reserves for incurred cost claim audits	$ 345,000		$ 93,000
Numerator for basic earnings per share:
Continuing operations attributable to AeroVironment	17,110,000	$ 20,337,000
Discontinued operations, net of tax		6,993,000
Net income attributable to AeroVironment	$ 17,110,000	$ 27,330,000
Denominator for basic earnings per share:
Weighted average common shares	23,745,199	23,574,595
Dilutive effect of employee stock options, restricted stock and restricted stock units	324,734	435,708
Denominator for diluted earnings per share	24,069,933	24,010,303
Number of shares reserved for issuance that are anti-dilutive	3,675	25,392

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