Earnings per Share - Antidilutive Securities (Details) - $ / shares shares in Millions	3 Months Ended	9 Months Ended
	Jan. 25, 2020	Jan. 25, 2020	Jan. 26, 2019
Anti-dilutive options
Outstanding options excluded from diluted share calculation (in shares)	0.4		0.4
Outstanding options
Anti-dilutive options
Outstanding options excluded from diluted share calculation (in shares)	0.3	0.3
Antidilutive options excluded from diluted share calculation, weighted average exercise price (in dollars per share)	$ 33.15	$ 33.15