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Related Party Transactions (Details)
3 Months Ended 9 Months Ended
Jan. 27, 2018
USD ($)
Jan. 27, 2018
USD ($)
Dec. 27, 2017
JPY (¥)
Dec. 27, 2017
USD ($)
Design and Development Agreement        
Long-Term Incentive Awards        
Maximum net value $ 65,011,481 $ 65,011,481    
HAPSMobile | Design and Development Agreement        
Long-Term Incentive Awards        
Revenue 5,500,000 15,100,000    
Unbilled related party receivables $ 1,648,000 $ 1,648,000    
HAPSMobile        
Long-Term Incentive Awards        
Ownership percentage     5.00% 5.00%
Payments for purchase of interest     ¥ 210,000,000 $ 1,860,000