Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 30, 2016	Aug. 01, 2015
Segment Data
Revenue	$ 36,218	$ 47,050
Cost of sales	29,535	31,027
Total gross margin	6,683	16,023
Selling, general and administrative	13,663	15,256
Research and development	8,600	9,831
Loss from operations	(15,580)	(9,064)
Interest income, net	375	224
Other expense, net	(300)	(2,389)
Loss before income taxes	(15,505)	(11,229)
Inter-segment and corporate elimination
Segment Data
Revenue	0	0
UAS
Segment Data
Revenue	30,497	40,167
Cost of sales	25,083	26,466
Total gross margin	5,414	13,701
EES
Segment Data
Revenue	5,721	6,883
Cost of sales	4,452	4,561
Total gross margin	$ 1,269	$ 2,322

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

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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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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