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Earnings per Share (Details 2) - Outstanding options - $ / shares
shares in Millions
3 Months Ended 9 Months Ended
Jan. 23, 2016
Jan. 24, 2015
Jan. 23, 2016
Jan. 24, 2015
Anti-dilutive options        
Outstanding options excluded from diluted share calculation (in shares) 0.4 0.4 0.4 0.4
Weighted average exercise price of options excluded from diluted share calculation (in dollars per share) $ 26.69 $ 23.63 $ 26.69 $ 23.63