Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				0 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014 Additional Paid-in Capital	Oct. 24, 2014 Retained Earnings	Nov. 12, 2014 Subsequent Event Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to equity awards	$ 456,000,000		$ 456,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years			2 years 7 months 6 days
Stock repurchase program, authorized amount	7,100,000,000		7,100,000,000
Allocation of purchase price of share repurchases			$ 718,900,000		$ 523,000,000	$ 195,900,000
Cash dividend per share of common stock	$ 0.165	$ 0.150	$ 0.330	$ 0.300			$ 0.165
Cash dividend payable date							Jan. 22, 2015
Cash dividend record date							Jan. 09, 2015