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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Apr. 30, 2021
Long-Term Incentive Awards      
Revenue $ 10,352 $ 16,386  
Unbilled related party receivables 5,568   $ 544
HAPSMobile | Design and Development Agreement      
Long-Term Incentive Awards      
Maximum net value 185,202    
Revenue 10,352 $ 16,386  
Unbilled related party receivables 5,568   $ 544
SoftBank | Design and Development Agreement      
Long-Term Incentive Awards      
Maximum net value $ 51,200