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Related Party Transactions (Details)
¥ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
USD ($)
Oct. 26, 2019
USD ($)
Oct. 31, 2020
USD ($)
Oct. 26, 2019
USD ($)
Apr. 30, 2020
USD ($)
Dec. 04, 2019
USD ($)
Dec. 04, 2019
JPY (¥)
Jul. 27, 2019
May 10, 2019
USD ($)
May 10, 2019
JPY (¥)
Apr. 30, 2019
Feb. 09, 2019
USD ($)
Feb. 09, 2019
JPY (¥)
Feb. 08, 2019
Jan. 29, 2019
USD ($)
Jan. 29, 2019
JPY (¥)
Apr. 17, 2018
USD ($)
Apr. 17, 2018
JPY (¥)
Dec. 27, 2017
USD ($)
Dec. 27, 2017
JPY (¥)
Long-Term Incentive Awards                                        
Revenue $ 11,452 $ 13,393 $ 27,838 $ 25,728                                
Unbilled related party receivables 14,974   14,974   $ 15,779                              
Design and Development Agreement                                        
Long-Term Incentive Awards                                        
Maximum net value 173,820   173,820                                  
HAPSMobile | Design and Development Agreement                                        
Long-Term Incentive Awards                                        
Revenue 11,452 $ 13,393 27,838 $ 25,728                                
Unbilled related party receivables $ 14,974   $ 14,974   $ 15,779                              
HAPSMobile                                        
Long-Term Incentive Awards                                        
Payments for purchase of interest           $ 4,982 ¥ 540,050   $ 4,569 ¥ 500,000   $ 5,671 ¥ 632,800   $ 1,926 ¥ 209,500 $ 1,407 ¥ 150,000 $ 1,860 ¥ 210,000
Ownership percentage   5.00%   5.00%   7.00% 7.00% 5.00% 10.00% 10.00% 10.00% 10.00% 10.00% 5.00% 5.00% 5.00%     5.00% 5.00%