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Stockholders' Equity - Income Tax Effects Associated with Employee Stock Transactions (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Income tax benefit associated with employee stock transactions $ 59 $ 57 $ 40