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Share Repurchase Program (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 27, 2018
Jan. 28, 2017
Jun. 17, 2016
Equity, Class of Treasury Stock [Line Items]      
Stock Repurchase Program, Authorized Amount     $ 40,000
Stock Repurchased During Period, Shares 0 284,000  
Stock Repurchased During Period, Value   $ 1,825  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 38,175