Employee Benefit Plans Summary Assumptions Related To And Valuation Of Employee Share-Based Awards (Time-Based Restricted Stock Units) (Detail) (Restricted Stock Units (RSUs) excluding market-based RSU [Member])	3 Months Ended		9 Months Ended
	Apr. 27, 2013	Apr. 28, 2012	Apr. 27, 2013	Apr. 28, 2012
Restricted Stock Units (RSUs) excluding market-based RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	2.70%	1.60%	3.00%	1.40%
Range of risk-free interest rates - minimum	0.10%	0.00%	0.00%	0.00%
Range of risk-free interest rates - maximum	0.90%	1.10%	0.90%	1.10%