Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

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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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Organization and Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Jan. 30, 2016 USD ($)	Apr. 30, 2016 USD ($) item	Apr. 30, 2015 USD ($)	Apr. 30, 2014 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current liabilities		$ 11,173,000	$ 9,170,000
Research and development		42,291,000	46,491,000	$ 25,515,000
Selling, general and administrative		60,077,000	55,763,000	55,679,000
Cost of sales		151,995,000	155,130,000	158,090,000
Property and equipment, net		16,762,000	13,499,000
Capital lease obligations - net of current portion		449,000
Capital lease obligations - current portion		390,000
Principle payments of capital lease obligations		$ 472,000
Segments
Number of reportable segments \| item		2
UAS
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales		$ 132,209,000	$ 128,233,000	$ 127,992,000
Out-of-Period Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current liabilities	$ 747,000
Research and development	503,000
Selling, general and administrative	155,000
Cost of sales	89,000
Property and equipment, net	584,000
Capital lease obligations - net of current portion	319,000
Capital lease obligations - current portion	324,000
Principle payments of capital lease obligations	$ 220,000
Sales Revenue \| Customer concentration \| Agencies of U.S. Government
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as a percent)		71.00%	80.00%	75.00%
Sales Revenue \| Customer concentration \| U.S. Army
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as a percent)		27.00%	47.00%	45.00%
Accounts receivable balances \| Credit concentration \| Agencies of U.S. Government
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as a percent)		39.00%	29.00%
Reportable segment sales \| Customer concentration \| U.S. Army \| UAS
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Concentration risk (as a percent)		31.00%	55.00%	54.00%