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Related Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Apr. 30, 2018
Dec. 27, 2017
Long-Term Incentive Awards            
Revenue $ 12,832,000 $ 7,071,000 $ 24,395,000 $ 9,622,000    
Unbilled related party receivables 7,764,000   7,764,000   $ 3,145,000  
Design and Development Agreement            
Long-Term Incentive Awards            
Maximum net value 76,589,000   76,589,000      
HAPSMobile | Design and Development Agreement            
Long-Term Incentive Awards            
Revenue 12,832,000 $ 7,071,000 24,395,000 $ 9,622,000    
Unbilled related party receivables $ 7,764,000   $ 7,764,000   $ 3,145,000  
AeroVironment | HAPSMobile            
Long-Term Incentive Awards            
Ownership percentage           5.00%