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Equity Method Investments (Details)
3 Months Ended
Jul. 28, 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 $ (602,000)            
HAPSMobile              
Equity Method Investments              
Payments for purchase of interest       ¥ 150,000,000 $ 1,407,000 ¥ 210,000,000 $ 1,860,000
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 (602,000)            
HAPSMobile | Other assets, long term              
Equity Method Investments              
Carrying value of investment $ 1,388,000            
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%