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Subsequent Events - (Details) - $ / shares
12 Months Ended
May 31, 2018
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Subsequent Event [Line Items]        
Cash dividend declared (usd per share)   $ 0.28 $ 0.31 $ 0.40
Subsequent Event        
Subsequent Event [Line Items]        
Cash dividend declared (usd per share) $ 0.07