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Accumulated Other Comprehensive Income and Reclassifications Adjustments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2020
Oct. 31, 2020
Oct. 26, 2019
Apr. 30, 2020
Apr. 30, 2019
Accumulated other comprehensive loss          
Balance, net of $0 deferred taxes, as of April 30, 2020 and April 30, 2019   $ 328      
Balance, net of $4 and $0 deferred taxes, as of August 1, 2020 and July 27, 2019, respectively $ 342 342   $ 328  
Unrealized loss on investments, net of deferred tax (expense) benefit (3) 1      
Accumulated Other Comprehensive Income          
Accumulated other comprehensive loss          
Balance, net of $0 deferred taxes, as of April 30, 2020 and April 30, 2019   328 $ 2 2  
Changes in foreign currency translation adjustments 75 75 179    
Unrealized losses, net of $4 of deferred taxes for the three months ended August 1, 2020   (61)      
Balance, net of $4 and $0 deferred taxes, as of August 1, 2020 and July 27, 2019, respectively $ 342 342 181 328 $ 2
Other comprehensive income, tax   1 $ 0 $ 0 $ 0
Unrealized loss on investments, net of deferred tax (expense) benefit   $ 1