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Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Segment Data (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Segment Data
Revenue	$ 125,376	$ 53,163	$ 50,116	$ 36,218	$ 84,757	$ 67,560	$ 64,731	$ 47,050	$ 264,873	$ 264,098	$ 259,398
Cost of sales									162,763	151,995	155,130
Total gross margin	$ 58,659	$ 19,351	$ 17,417	$ 6,683	$ 37,922	$ 26,625	$ 31,533	$ 16,023	102,110	112,103	104,268
Selling, general and administrative									56,537	60,077	55,763
Research and development									33,042	42,291	46,491
Income from operations									12,531	9,735	2,014
Interest income, net									1,618	1,032	882
Other income (expense), net									60	(2,699)	(1,003)
Income before income taxes									14,209	8,068	1,893
Inter-segment and corporate elimination
Segment Data
Revenue									0	0	0
UAS
Segment Data
Revenue									228,940	233,738	220,950
Cost of sales									135,937	132,209	128,233
Total gross margin									93,003	101,529	92,717
EES
Segment Data
Revenue									35,933	30,360	38,448
Cost of sales									26,826	19,786	26,897
Total gross margin									$ 9,107	$ 10,574	$ 11,551