Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 28, 2017	Jan. 30, 2016	Jan. 28, 2017	Jan. 30, 2016
Segment Data
Revenue	$ 53,163	$ 67,560	$ 139,497	$ 179,341
Cost of sales	33,812	40,935	96,046	105,160
Total gross margin	19,351	26,625	43,451	74,181
Selling, general and administrative	12,788	13,313	39,838	43,302
Research and development	7,988	8,247	25,105	27,975
(Loss) income from operations	(1,425)	5,065	(21,492)	2,904
Interest income, net	390	181	1,162	673
Other expense, net	(46)	(215)	(476)	(2,796)
(Loss) income before income taxes	(1,081)	5,031	(20,806)	781
Inter-segment and corporate elimination
Segment Data
Revenue			0	0
UAS
Segment Data
Revenue	41,894	61,086	113,220	157,842
Cost of sales	25,530	36,488	76,549	91,268
Total gross margin	16,364	24,598	36,671	66,574
EES
Segment Data
Revenue	11,269	6,474	26,277	21,499
Cost of sales	8,282	4,447	19,497	13,892
Total gross margin	$ 2,987	$ 2,027	$ 6,780	$ 7,607

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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