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Equity Method Investments (Details)
3 Months Ended 6 Months Ended
Oct. 27, 2018
USD ($)
Oct. 27, 2018
USD ($)
Jan. 31, 2019
JPY (¥)
Jan. 31, 2019
USD ($)
Apr. 17, 2018
JPY (¥)
Apr. 17, 2018
USD ($)
Dec. 27, 2017
JPY (¥)
Dec. 27, 2017
USD ($)
Equity Method Investments                
Equity method investment activity, net of tax $ (752,000) $ (1,354,000)            
HAPSMobile                
Equity Method Investments                
Payments for purchase of interest         ¥ 1,407,000 $ 150,000,000 ¥ 1,860,000 $ 210,000,000
HAPSMobile | Expected                
Equity Method Investments                
Payments for purchase of interest     ¥ 209,500,000 $ 1,900,000        
HAPSMobile | Equity method investment activity, net of tax                
Equity Method Investments                
Equity method investment activity, net of tax (752,000) (1,354,000)            
HAPSMobile | Other assets, long term                
Equity Method Investments                
Carrying value of investment $ 625,000 $ 625,000            
HAPSMobile | SoftBank                
Equity Method Investments                
Ownership percentage             95.00% 95.00%
AeroVironment | HAPSMobile                
Equity Method Investments                
Ownership percentage             5.00% 5.00%
Option to increase its ownership percentage 19.00% 19.00%