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Equity Methods Investments - Investment in Limited Partnership Fund (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 29, 2022
Jan. 30, 2021
Jan. 29, 2022
Jan. 30, 2021
Apr. 30, 2021
Equity Method Investments          
Equity method investment income (loss), net of tax $ 171 $ (81) $ 163 $ (10,891)  
Carrying value of investment 12,388   12,388   $ 7,168
Limited Partnership Fund          
Equity Method Investments          
Capital contributions     2,377 2,150  
Limited Partnership Fund | Equity method investment loss, net of tax          
Equity Method Investments          
Equity method investment income (loss), net of tax 478 81 2,843 361  
Income tax expense from equity method investments 108   636    
Limited Partnership Fund | Long term investments          
Equity Method Investments          
Carrying value of investment $ 12,388   $ 12,388   $ 7,168
HAPSMobile | Equity method investment loss, net of tax          
Equity Method Investments          
Equity method investment income (loss), net of tax   $ 0   $ (10,810)