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Net Income per Share - Anti-Dilutive Shares Excluded from Calculation of Net Income Per Share (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 24, 2014
Oct. 25, 2013
Oct. 24, 2014
Oct. 25, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Employee equity award plans 7.3 7.2 7.9 6.9