Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Segment Data
Revenue	$ 73,827	$ 50,116	$ 117,591	$ 86,334
Cost of sales	42,827	32,699	74,961	62,234
Total gross margin	31,000	17,417	42,630	24,100
Selling, general and administrative	14,464	13,387	27,795	27,050
Research and development	7,272	8,517	13,733	17,117
Income (loss) from operations	9,264	(4,487)	1,102	(20,067)
Interest income, net	432	397	944	772
Other expense, net	(55)	(130)	(51)	(430)
Income (loss) before income taxes	9,641	(4,220)	1,995	(19,725)
Inter-segment and corporate elimination
Segment Data
Revenue			0	0
UAS
Segment Data
Revenue	63,988	40,829	100,238	71,326
Cost of sales	35,817	25,936	62,225	51,019
Total gross margin	28,171	14,893	38,013	20,307
EES
Segment Data
Revenue	9,839	9,287	17,353	15,008
Cost of sales	7,010	6,763	12,736	11,215
Total gross margin	$ 2,829	$ 2,524	$ 4,617	$ 3,793

The aggregate cost of goods produced and sold and services rendered during the reporting period.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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