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Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 28, 2023
Jan. 29, 2022
Jan. 28, 2023
Jan. 29, 2022
Apr. 30, 2022
Segment Reporting Information [Line Items]          
Gross margin $ 45,510 $ 21,436 $ 105,114 $ 92,614  
Income (loss) from operations 4,607 (14,126) (12,981) (22,900)  
Total assets 921,202   921,202   $ 914,200
Product segments          
Segment Reporting Information [Line Items]          
Revenue 134,395 90,093 354,495 313,110  
Gross margin 45,510 21,436 105,114 92,614  
Income (loss) from operations 4,607 (14,126) (12,981) (22,900)  
Acquisition-related expenses 286 368 1,190 4,469  
Amortization of acquired intangible assets and other purchase accounting adjustments 7,146 9,383 21,949 28,837  
Adjusted income (loss) from operations 12,039 (4,375) 10,158 10,406  
Total assets 921,202   921,202   914,200
Small UAS | Product segments          
Segment Reporting Information [Line Items]          
Revenue 69,376 24,366 139,313 119,004  
Gross margin 32,937 8,656 66,552 53,330  
Income (loss) from operations 18,548 (3,606) 24,495 11,729  
Acquisition-related expenses   99   819  
Amortization of acquired intangible assets and other purchase accounting adjustments 669 707 2,019 2,121  
Adjusted income (loss) from operations 19,217 (2,800) 26,514 14,669  
Total assets 168,081   168,081   110,286
TMS | Product segments          
Segment Reporting Information [Line Items]          
Revenue 24,015 18,603 78,127 56,197  
Gross margin 7,841 5,209 28,224 17,420  
Income (loss) from operations (129) (1,289) 845 (1,705)  
Acquisition-related expenses   54   468  
Adjusted income (loss) from operations (129) (1,235) 845 (1,237)  
Total assets 67,786   67,786   91,862
MUAS | Product segments          
Segment Reporting Information [Line Items]          
Revenue 15,405 21,168 61,948 70,072  
Gross margin (2,008) 335 (9,965) 5,739  
Income (loss) from operations (11,824) (8,623) (36,651) (22,004)  
Acquisition-related expenses 129 41 470 1,533  
Amortization of acquired intangible assets and other purchase accounting adjustments 5,215 5,641 16,057 17,190  
Adjusted income (loss) from operations (6,480) (2,941) (20,124) (3,281)  
Total assets 379,307   379,307   388,058
HAPSMobile          
Segment Reporting Information [Line Items]          
Revenue 8,938 9,543      
Gross margin 2,733 3,173      
Income (loss) from operations 1,334 1,574      
Acquisition-related expenses   19      
Amortization of acquired intangible assets and other purchase accounting adjustments   2      
Adjusted income (loss) from operations 1,334 1,595      
Total assets 7,937   7,937   8,148
HAPSMobile | Product segments          
Segment Reporting Information [Line Items]          
Revenue     28,219 30,237  
Gross margin     9,059 10,291  
Income (loss) from operations     5,436 4,750  
Acquisition-related expenses       181  
Amortization of acquired intangible assets and other purchase accounting adjustments       5  
Adjusted income (loss) from operations     5,436 4,936  
All other | Product segments          
Segment Reporting Information [Line Items]          
Revenue 16,661 16,413 46,888 37,600  
Gross margin 4,007 4,063 11,244 5,834  
Income (loss) from operations (3,322) (2,182) (7,106) (15,670)  
Acquisition-related expenses 157 155 720 1,468  
Amortization of acquired intangible assets and other purchase accounting adjustments 1,262 3,033 3,873 9,521  
Adjusted income (loss) from operations (1,903) $ 1,006 (2,513) $ (4,681)  
Total assets 84,989   84,989   86,617
Corporate | Product segments          
Segment Reporting Information [Line Items]          
Total assets $ 213,102   $ 213,102   $ 229,229