Employee Benefit Plans (Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Employee Stock Purchase Rights)) (Detail) (EMPLOYEE STOCK PURCHASE RIGHTS, USD $)	12 Months Ended
	Jul. 27, 2013	Jul. 28, 2012	Jul. 30, 2011
EMPLOYEE STOCK PURCHASE RIGHTS
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	28.70%	27.20%	35.10%
Risk-free interest rate	0.40%	0.20%	0.90%
Expected dividend	1.50%	1.50%	0.00%
Expected life (in years)	1 year 9 months	9 months	1 year 9 months
Weighted-average estimated grant date fair value per share, dollars per share	$ 4.68	$ 3.81	$ 6.31