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Restricted Cash (Details) - USD ($)
$ in Thousands
Jan. 26, 2019
Apr. 28, 2018
Jan. 27, 2018
Apr. 29, 2017
Restricted Cash        
Cash and cash equivalents $ 101,579 $ 134,515 $ 135,266  
Restricted cash 2,003 2,356 2,354  
Total cash, cash equivalents and restricted cash $ 103,582 $ 136,871 $ 137,620 $ 150,859