Subsequent Events - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	12 Months Ended	119 Months Ended		12 Months Ended	1 Months Ended			12 Months Ended
	Apr. 26, 2013	Apr. 26, 2013	Apr. 27, 2012	Apr. 26, 2013 Convertible Notes Payable	May 21, 2013 Subsequent Event	May 31, 2013 Subsequent Event	Jun. 05, 2013 Subsequent Event	Jun. 01, 2013 Subsequent Event Convertible Notes Payable
Subsequent Event [Line Items]
Quarterly cash dividend per share of common stock					$ 0.15
Dividend declaration date					May 21, 2013
Dividend payable date					Jul. 23, 2013
Dividend record date					Jul. 11, 2013
Increase in stock repurchase program	$ 1,500,000,000	$ 5,500,000,000				$ 1,600,000,000
Convertible notes maturity date				Jun. 01, 2013
Cash payment to extinguish convertible notes								1,265,000,000
Common stock shares issued for excess conversion value								4.9
Shares received in exercise of convertible note hedge								3.9
Amount prepaid to purchase shares of common stock under ASR agreement			$ 600,000,000				$ 750,000,000