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Geographic Information (Details) - Non-U.S. customers - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Product Information
Deploys in-service assets	$ 36,047,000
Arcturus UAV Inc.
Product Information
Deploys in-service assets	48,496,000
Telerob
Product Information
Deploys in-service assets	$ 1,601,000
Customer concentration | Sales Revenue
Product Information
Percentage of revenue	41.00%	39.00%	45.00%

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