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Related Party Transactions (Details)
¥ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 30, 2021
USD ($)
Jan. 25, 2020
USD ($)
Jan. 30, 2021
USD ($)
Jan. 25, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 04, 2019
USD ($)
Dec. 04, 2019
JPY (¥)
May 10, 2019
USD ($)
May 10, 2019
JPY (¥)
Feb. 09, 2019
USD ($)
Feb. 09, 2019
JPY (¥)
Feb. 08, 2019
Jan. 29, 2019
USD ($)
Jan. 29, 2019
JPY (¥)
May 09, 2018
Apr. 17, 2018
USD ($)
Apr. 17, 2018
JPY (¥)
Dec. 27, 2017
USD ($)
Dec. 27, 2017
JPY (¥)
Long-Term Incentive Awards                                      
Revenue $ 7,480 $ 11,762 $ 35,318 $ 37,491                              
Unbilled related party receivables 6,834   6,834   $ 15,779                            
Design and Development Agreement                                      
Long-Term Incentive Awards                                      
Maximum net value 181,320   181,320                                
HAPSMobile | Design and Development Agreement                                      
Long-Term Incentive Awards                                      
Revenue 7,480 $ 11,762 35,318 $ 37,491                              
Unbilled related party receivables $ 6,834   $ 6,834   $ 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           7.00% 7.00% 5.00% 5.00% 10.00% 10.00% 5.00% 5.00% 5.00% 10.00%     5.00% 5.00%