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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		9 Months Ended
	Jan. 24, 2014	Jan. 25, 2013	Jan. 24, 2014	Jan. 25, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Employee equity award plans	5.7	15.0	6.5	16.4

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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