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Restricted Cash (Details) - USD ($)
$ in Thousands
Apr. 25, 2020
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 261,553 $ 129,819    
Restricted cash 1,975 1,968    
Total cash, cash equivalents and restricted cash $ 263,528 $ 131,787 $ 136,871 $ 150,859