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Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 30, 2021
Oct. 31, 2020
Oct. 30, 2021
Oct. 31, 2020
Apr. 30, 2021
Segments          
Gross margin $ 42,455 $ 40,851 $ 71,178 $ 76,262  
Income (loss) from operations 3,339 13,898 (8,774) 26,195  
Total assets 925,307   925,307   $ 928,566
Product segments          
Segments          
Revenue 122,008 92,665 223,017 180,115  
Gross margin 42,455 40,851 71,178 76,262  
Income (loss) from operations 3,339 13,898 (8,774) 26,195  
Acquisition-related costs 848 414 4,102 414  
Amortization of acquired intangible assets and other purchase accounting adjustments 10,322 715 19,446 1,376  
Adjusted income (loss) from operations 14,509 15,027 14,774 27,985  
Total assets 925,307   925,307   928,566
Small UAS | Product segments          
Segments          
Revenue 54,714 58,265 94,638 114,467  
Gross margin 27,754 29,695 44,674 57,178  
Income (loss) from operations 13,377 15,386 15,335 30,583  
Acquisition-related costs 297 171 721 171  
Amortization of acquired intangible assets and other purchase accounting adjustments 707 715 1,414 1,376  
Adjusted income (loss) from operations 14,381 16,272 17,470 32,130  
Total assets 97,657   97,657   113,072
TMS | Product segments          
Segments          
Revenue 18,418 18,961 37,594 28,495  
Gross margin 6,222 5,943 12,211 7,863  
Income (loss) from operations 47 (995) (416) (5,140)  
Acquisition-related costs 163 94 414 94  
Adjusted income (loss) from operations 210 (901) (2) (5,046)  
Total assets 85,105   85,105   71,707
MUAS | Product segments          
Segments          
Revenue 26,525   48,904    
Gross margin 2,223   5,404    
Income (loss) from operations (7,000)   (13,381)    
Acquisition-related costs 108 58 1,492 58  
Amortization of acquired intangible assets and other purchase accounting adjustments 6,358   11,549    
Adjusted income (loss) from operations (534) 58 (340) 58  
Total assets 390,126   390,126   402,037
All other | Product segments          
Segments          
Revenue 22,351 15,439 41,881 37,153  
Gross margin 6,256 5,213 8,889 11,221  
Income (loss) from operations (3,085) (493) (10,312) 752  
Acquisition-related costs 280 91 1,475 91  
Amortization of acquired intangible assets and other purchase accounting adjustments 3,257   6,483    
Adjusted income (loss) from operations 452 $ (402) (2,354) $ 843  
Total assets 101,147   101,147   39,581
Corporate | Product segments          
Segments          
Total assets $ 251,272   $ 251,272   $ 302,169