Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 29, 2022	Oct. 30, 2021	Oct. 29, 2022	Oct. 30, 2021	Apr. 30, 2022
Segment Reporting Information [Line Items]
Gross margin	$ 25,890	$ 42,455	$ 59,604	$ 71,178
Income (loss) from continuing operations	(14,314)	3,339	(17,588)	(8,774)
Total assets	891,682		891,682		$ 914,200
Product segments
Segment Reporting Information [Line Items]
Revenue	111,584	122,008	220,100	223,017
Gross margin	25,890	42,455	59,604	71,178
Income (loss) from continuing operations	(14,314)	3,339	(17,588)	(8,774)
Acquisition-related expenses	569	848	904	4,102
Amortization of acquired intangible assets and other purchase accounting adjustments	7,842	10,322	14,803	19,446
Adjusted income (loss) from operations	(5,903)	14,509	(1,881)	14,774
Total assets	891,682		891,682		914,200
Small UAS | Product segments
Segment Reporting Information [Line Items]
Revenue	26,681	54,714	69,937	94,638
Gross margin	12,319	27,754	33,615	44,674
Income (loss) from continuing operations	(2,079)	13,377	5,946	15,335
Acquisition-related expenses		297		721
Amortization of acquired intangible assets and other purchase accounting adjustments	669	707	1,350	1,414
Adjusted income (loss) from operations	(1,410)	14,381	7,296	17,470
Total assets	103,277		103,277		110,286
TMS | Product segments
Segment Reporting Information [Line Items]
Revenue	31,101	18,418	54,113	37,594
Gross margin	12,636	6,222	20,383	12,211
Income (loss) from continuing operations	2,004	47	973	(416)
Acquisition-related expenses		163		414
Adjusted income (loss) from operations	2,004	210	973	(2)
Total assets	77,334		77,334		91,862
MUAS | Product segments
Segment Reporting Information [Line Items]
Revenue	27,281	26,525	46,542	48,904
Gross margin	(6,884)	2,223	(7,957)	5,404
Income (loss) from continuing operations	(15,242)	(7,000)	(24,826)	(13,381)
Acquisition-related expenses	119	108	340	1,492
Amortization of acquired intangible assets and other purchase accounting adjustments	5,897	6,358	10,842	11,549
Adjusted income (loss) from operations	(9,226)	(534)	(13,644)	(340)
Total assets	394,872		394,872		388,058
HAPSMobile
Segment Reporting Information [Line Items]
Revenue	9,066	10,342
Gross margin	3,001	3,944
Income (loss) from continuing operations	1,564	2,073
Acquisition-related expenses		58
Adjusted income (loss) from operations	1,564	2,131
Total assets	7,200		7,200		8,148
HAPSMobile | Product segments
Segment Reporting Information [Line Items]
Revenue			19,281	20,694
Gross margin			6,325	7,118
Income (loss) from continuing operations			4,103	3,176
Acquisition-related expenses				162
Adjusted income (loss) from operations			4,103	3,338
All other | Product segments
Segment Reporting Information [Line Items]
Revenue	17,455	12,009	30,227	21,187
Gross margin	4,818	2,312	7,238	1,771
Income (loss) from continuing operations	(561)	(5,158)	(3,784)	(13,488)
Acquisition-related expenses	450	222	564	1,313
Amortization of acquired intangible assets and other purchase accounting adjustments	1,276	3,257	2,611	6,483
Adjusted income (loss) from operations	1,165	$ (1,679)	(609)	$ (5,692)
Total assets	72,098		72,098		86,617
Corporate | Product segments
Segment Reporting Information [Line Items]
Total assets	$ 236,901		$ 236,901		$ 229,229