Employee Benefit Plans (Additional Information - 401K and Def Comp) (Details) - USD ($)	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
401(k) Plan
401(k) and Deferred Compensation Plan [Line Items]
Maximum Annual Contributions Per Employee (%)	75.00%
Employer Matching Contribution (%)	4.50%
Employer matching contribution, percentage of the first 4.5% of eligible earnings, (%)	100.00%
Maximum Matching Contribution per Employee By Company (by Calendar Year)	$ 11,925
Maximum Annual Contributions Per Employee, Amount (by Calendar Year)	265,000
Total matching contribution by the Company for the period	$ 244,000,000	$ 236,000,000	$ 234,000,000
401(k) Catch Up Contribution
401(k) and Deferred Compensation Plan [Line Items]
Maximum Annual Contributions Per Employee (%)	75.00%
Deferred Compensation Plans
401(k) and Deferred Compensation Plan [Line Items]
Employer Matching Contribution (%)	4.50%
Maximum Annual Contributions Per Employee, Amount (by Calendar Year)	$ 1,500,000
Deferred Compensation Liability, Classified, Noncurrent	$ 536,000,000	$ 509,000,000