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Earnings per Share - Antidilutive Securities (Details) - $ / shares
shares in Millions
3 Months Ended
Jul. 27, 2019
Jul. 28, 2018
Anti-dilutive options    
Weighted average exercise price of options excluded from diluted share calculation (in dollars per share)   $ 400,000
Outstanding options    
Anti-dilutive options    
Outstanding options excluded from diluted share calculation (in shares) 0.4  
Weighted average exercise price of options excluded from diluted share calculation (in dollars per share) $ 33.15