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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 30, 2021
Oct. 31, 2020
Oct. 30, 2021
Oct. 31, 2020
Consolidated Statements of Cash Flows        
Unrealized loss on available-for-sale investments, deferred tax benefit $ 0 $ (3) $ 0 $ 1