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Organization and Significant Accounting Policies - Government Contracts (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018	Apr. 30, 2019
Government Contracts
Reserves for incurred cost claim audits	$ 345,000		$ 345,000		$ 93,000
Numerator for basic earnings per share:
Continuing operations attributable to AeroVironment	7,501,000	$ 7,047,000	24,611,000	$ 27,384,000
Discontinued operations, net of tax		(990,000)		6,003,000
Net income attributable to AeroVironment	$ 7,501,000	$ 6,057,000	$ 24,611,000	$ 33,387,000
Denominator for basic earnings per share:
Weighted average common shares	23,804,364	23,667,400	23,775,355	23,621,720
Dilutive effect of employee stock options, restricted stock and restricted stock units	257,446	431,433	288,420	437,674
Denominator for diluted earnings per share	24,061,810	24,098,833	24,063,775	24,059,394
Number of shares reserved for issuance that are anti-dilutive	8,402	598	4,358	7,130

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