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Related Party Transactions (Details) - USD ($)
3 Months Ended
Jul. 27, 2019
Jul. 28, 2018
May 10, 2019
Apr. 30, 2019
Feb. 09, 2019
Feb. 08, 2019
Jan. 29, 2019
Dec. 27, 2017
Long-Term Incentive Awards                
Revenue $ 12,335,000 $ 11,563,000            
Unbilled related party receivables 12,649,000     $ 9,028,000        
Design and Development Agreement                
Long-Term Incentive Awards                
Maximum net value 134,354,000              
HAPSMobile | Design and Development Agreement                
Long-Term Incentive Awards                
Revenue 12,335,000 $ 11,563,000            
Unbilled related party receivables $ 12,649,000     $ 9,028,000        
HAPSMobile                
Long-Term Incentive Awards                
Ownership percentage 5.00%   10.00% 10.00% 10.00% 5.00% 5.00% 5.00%
AeroVironment | HAPSMobile                
Long-Term Incentive Awards                
Ownership percentage 5.00%