Employee Benefit Plans (Summary Of Stock Option Activity) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Apr. 26, 2014	Jul. 27, 2013
Summary of Stock Option Activity
Beginning balance, Number Outstanding (in shares)	276	520
Assumed from acquisitions	6	10
Exercised	(45)	(154)
Canceled/forfeited/expired	(14)	(100)
Ending balance, Number Outstanding (in shares)	223	276
Weighted-average exercise price per share, beginning balance	$ 24.44	$ 22.68
Assumed from acquisitions, weighted-average exercise price per share	$ 3.69	$ 0.77
Exercised, weighted-average exercise price per share	$ 17.54	$ 18.51
Canceled/forfeited/expired, weighted-average exercise price per share	$ 27.41	$ 22.18
Weighted-average exercise price per share, ending balance	$ 25.09	$ 24.44