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Subsequent Events (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2021
USD ($)
investment
Apr. 24, 2021
USD ($)
Apr. 25, 2020
USD ($)
investment
Apr. 27, 2019
USD ($)
Jul. 27, 2019
investment
Subsequent Event [Line Items]          
Number of investments | investment     1   1
Gain on investment   $ 0 $ 34,334 $ 4,477  
Subsequent Events | Scenario, Forecast          
Subsequent Event [Line Items]          
Number of investments | investment 1        
Proceeds from sale of investment $ 54        
Gain on investment $ 28