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Organization and Significant Accounting Policies - Government Contracts (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019	Apr. 30, 2019
Government Contracts
Reserves for incurred cost claim audits	$ 275,000		$ 275,000		$ 93,000
Numerator for basic earnings per share:
Continuing operations attributable to AeroVironment	(1,008,000)	$ 8,431,000	23,603,000	$ 35,815,000
Discontinued operations, net of tax		(62,000)		5,941,000
Net (loss) income attributable to AeroVironment	$ (1,008,000)	$ 8,369,000	$ 23,603,000	$ 41,756,000
Denominator for basic (loss) earnings per share:
Weighted average common shares	23,821,145	23,687,672	23,790,788	23,643,866
Dilutive effect of employee stock options, restricted stock and restricted stock units		394,147	285,407	420,142
Denominator for diluted (loss) earnings per share	23,821,145	24,081,819	24,076,195	24,064,008
Number of shares reserved for issuance	0		0
Number of anti-dilutive shares	287,408	1,705	3,076	5,519

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