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Business Acquisitions - Pulse (Details)
 9 Months Ended 12 Months Ended
Feb. 26, 2020
USD ($)
Jun. 10, 2019
USD ($)
item
Jan. 25, 2020
USD ($)
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Business Acquisitions            
Holdback and retention payments       $ 1,492,000    
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Goodwill       314,205,000 $ 6,340,000  
Supplemental Pro forma Information            
Amortization of Intangible Assets       6,469,000 2,822,000 $ 357,000
Altoy            
Business Acquisitions            
Amount of retention to cover post closing indemnification claims   $ 250,000        
Amount of holdback   1,250,000        
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Goodwill   6,340,000        
Inventory   334,000        
Other assets, net of liabilities assumed   (614,000)        
Total assets acquired   21,880,000        
Fair value of consideration transferred:            
Cash   18,677,000        
Holdback   1,250,000        
Retention   250,000        
Contingent consideration   1,703,000        
Total   21,880,000        
Supplemental Pro forma Information            
Revenue         367,523,000 316,878,000
Net income (loss)         41,481,000 $ 43,204,000
Altoy | Technology            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets   14,950,000        
Altoy | In-process research and development            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets   550,000        
Altoy | Non-compete agreements            
Business Combinations, Assets Acquired and Liabilities Assumed at Acquisition Date            
Intangible assets   $ 320,000        
Pulse Aerospace, LLC            
Business Acquisitions            
Ownership interest acquired   100.00%        
Amount of cash less closing indebtedness and transaction costs   $ 20,650,000        
Amount of retention to cover post closing indemnification claims   250,000        
Amount of holdback   $ 1,250,000        
Number of months after closing holdback will be paid   18 months        
Holdback and retention payments       1,492,000    
Number of research and development milestones | item   2        
Each milestone achievement $ 2,500,000          
Total milestone achievement   $ 5,000,000        
Additional consideration   $ 1,703,000        
Period of goodwill deduction   15 years        
Fair value of consideration transferred:            
Holdback   $ 1,250,000        
Retention   $ 250,000        
Supplemental Pro forma Information            
Revenue         6,607,000  
Amortization of Intangible Assets         $ 2,461,000  
Pulse Aerospace, LLC | Discount rate            
Business Acquisitions            
Measurement input   4.5        
Pulse Aerospace, LLC | SG&A            
Business Acquisitions            
Business acquisitions gain       $ 832,000    
Pulse Aerospace, LLC | Minimum            
Business Acquisitions            
Each milestone achievement   $ 0        
Pulse Aerospace, LLC | Maximum            
Business Acquisitions            
Each milestone achievement   $ 2,500,000        
Fair value of consideration transferred:            
Cash     $ 6,000,000