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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared per share $ 0.28 $ 0.31 $ 0.40