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Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Segment Reporting Information [Line Items]      
Gross margin $ 141,236 $ 164,558 $ 153,102
Income (loss) from continuing operations (9,887) 43,313 47,135
Total assets 914,200 928,566  
Product segments      
Segment Reporting Information [Line Items]      
Revenue 445,732 394,912 367,296
Gross margin 141,236 164,558 153,102
Income (loss) from continuing operations (9,887) 43,313 47,135
Acquisition-related expenses 4,854 7,981 1,119
Amortization of acquired intangible assets and other purchase accounting adjustments 36,707 7,458 2,467
Adjusted income (loss) from operations 31,674 58,752 50,721
Total assets 914,200 928,566  
Small UAS | Product segments      
Segment Reporting Information [Line Items]      
Revenue 178,201 235,854 225,888
Gross margin 83,759 119,062 117,538
Income (loss) from continuing operations 28,980 58,194 64,680
Acquisition-related expenses 502 3,026 537
Amortization of acquired intangible assets and other purchase accounting adjustments 2,828 2,649 2,467
Adjusted income (loss) from operations 32,310 63,869 67,684
Total assets 110,286 115,156  
TMS | Product segments      
Segment Reporting Information [Line Items]      
Revenue 76,415 87,268 63,781
Gross margin 24,486 26,675 18,082
Income (loss) from continuing operations (3,120) (3,131) (15,822)
Acquisition-related expenses 297 1,661 336
Adjusted income (loss) from operations (2,823) (1,470) (15,486)
Total assets 91,862 72,073  
MUAS | Product segments      
Segment Reporting Information [Line Items]      
Revenue 93,156 15,837  
Gross margin 6,155 2,965  
Income (loss) from continuing operations (27,715) (1,869)  
Acquisition-related expenses 1,994 1,682  
Amortization of acquired intangible assets and other purchase accounting adjustments 22,170 4,356  
Adjusted income (loss) from operations (3,551) 4,169  
Total assets 388,058 400,901  
HAPSMobile | Product segments      
Segment Reporting Information [Line Items]      
Revenue 43,325 42,426 60,864
Gross margin 15,533 13,038 17,436
Income (loss) from continuing operations 8,056 268 9,744
Acquisition-related expenses 123 593 134
Adjusted income (loss) from operations 8,179 861 9,878
Total assets 8,148 598  
All other | Product segments      
Segment Reporting Information [Line Items]      
Revenue 54,635 13,527 16,763
Gross margin 11,303 2,818 46
Income (loss) from continuing operations (16,088) (10,149) (11,467)
Acquisition-related expenses 1,938 1,019 112
Amortization of acquired intangible assets and other purchase accounting adjustments 11,709 453  
Adjusted income (loss) from operations (2,441) (8,677) $ (11,355)
Total assets 86,617 37,677  
Corporate | Product segments      
Segment Reporting Information [Line Items]      
Total assets $ 229,229 $ 302,161