Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Segment Data
Revenue	$ 50,116	$ 64,731	$ 86,334	$ 111,781
Cost of sales	32,699	33,198	62,234	64,225
Total gross margin	17,417	31,533	24,100	47,556
Selling, general and administrative	13,387	14,733	27,050	29,989
Research and development	8,517	9,897	17,117	19,728
(Loss) income from operations	(4,487)	6,903	(20,067)	(2,161)
Interest income, net	397	268	772	492
Other expense, net	(130)	(192)	(430)	(2,581)
(Loss) income before income taxes	(4,220)	6,979	(19,725)	(4,250)
Inter-segment and corporate elimination
Segment Data
Revenue			0	0
UAS
Segment Data
Revenue	40,829	56,589	71,326	96,756
Cost of sales	25,936	28,314	51,019	54,780
Total gross margin	14,893	28,275	20,307	41,976
EES
Segment Data
Revenue	9,287	8,142	15,008	15,025
Cost of sales	6,763	4,884	11,215	9,445
Total gross margin	$ 2,524	$ 3,258	$ 3,793	$ 5,580

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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