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Goodwill (Details)
6 Months Ended 9 Months Ended
Jan. 31, 2020
USD ($)
operating_segment
Jan. 31, 2020
USD ($)
Aug. 01, 2019
$ / shares
Goodwill [Roll Forward]      
Beginning balance $ 310,489,000    
Ending balance $ 328,476,000 $ 328,476,000  
Number of reportable segments | operating_segment 2    
Commercial Solutions Segment      
Goodwill [Roll Forward]      
Beginning balance $ 251,296,000    
Ending balance 253,333,000 253,333,000  
Reporting unit, percentage of fair value in excess of carrying amount     29.00%
Government Solutions Segment      
Goodwill [Roll Forward]      
Beginning balance 59,193,000    
Ending balance 75,143,000 75,143,000  
Reporting unit, percentage of fair value in excess of carrying amount     122.20%
Common Stock      
Goodwill [Roll Forward]      
Common stock price (in dollars per share) | $ / shares     $ 29.54
Solacom      
Goodwill [Roll Forward]      
Change resulting from acquisitions, adjustments (420,000)    
Solacom | Commercial Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions, adjustments (420,000)    
Solacom | Government Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions, adjustments 0    
GD NG-911 business      
Goodwill [Roll Forward]      
Change resulting from acquisitions, adjustments   2,655,000  
Change resulting from acquisitions 2,457,000    
Ending balance 10,505,000 $ 10,505,000  
GD NG-911 business | Commercial Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions 2,457,000    
GD NG-911 business | Government Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions 0    
CGC Technology      
Goodwill [Roll Forward]      
Change resulting from acquisitions 15,950,000    
CGC Technology | Commercial Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions 0    
CGC Technology | Government Solutions Segment      
Goodwill [Roll Forward]      
Change resulting from acquisitions $ 15,950,000