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Restricted Cash (Details) - USD ($)
$ in Thousands
Jul. 27, 2019
Apr. 27, 2019
Jul. 28, 2018
Apr. 28, 2018
Restricted Cash        
Cash and cash equivalents $ 111,622 $ 129,819 $ 134,247  
Restricted cash 1,970 1,968 2,358  
Total cash, cash equivalents and restricted cash $ 113,592 $ 131,787 $ 136,605 $ 136,871