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Related Party Transactions (Details)
¥ in Thousands
3 Months Ended 9 Months Ended
Jan. 25, 2020
USD ($)
Jan. 26, 2019
USD ($)
Jan. 25, 2020
USD ($)
Jan. 26, 2019
USD ($)
Dec. 04, 2019
USD ($)
Dec. 04, 2019
JPY (¥)
Jul. 27, 2019
May 10, 2019
USD ($)
May 10, 2019
JPY (¥)
Apr. 30, 2019
USD ($)
Feb. 09, 2019
USD ($)
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 $ 11,762,000 $ 13,586,000 $ 37,491,000 $ 37,981,000                              
Unbilled related party receivables 28,849,000   28,849,000             $ 9,028,000                  
Design and Development Agreement                                      
Long-Term Incentive Awards                                      
Maximum net value 148,576,000   148,576,000                                
HAPSMobile | Design and Development Agreement                                      
Long-Term Incentive Awards                                      
Revenue 11,762,000 $ 13,586,000 37,491,000 $ 37,981,000                              
Unbilled related party receivables $ 28,849,000   $ 28,849,000             $ 9,028,000                  
HAPSMobile                                      
Long-Term Incentive Awards                                      
Payments for purchase of interest         $ 4,982,000 ¥ 540,050   $ 4,569,000 ¥ 500,000   $ 5,671,000 ¥ 632,800   $ 1,926,000 ¥ 209,500 $ 1,407,000 ¥ 150,000 $ 1,860,000 ¥ 210,000
Ownership percentage         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%