Employee Benefit Plans (Additional Information - 401K and Def Comp) (Details) - USD ($)	12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Deferred Compensation Plans
401(k) and Deferred Compensation Plan [Line Items]
Employer matching contribution	4.50%
Maximum annual contributions	$ 1,500,000
Deferred compensation liability	$ 622,000,000	$ 569,000,000
401(K) Plan
401(k) and Deferred Compensation Plan [Line Items]
Allowed employee contributions (up to)	75.00%
Employer matching contribution, percentage of the first 4.5% of eligible earnings	100.00%
Employer matching contribution	4.50%
Maximum matching contribution	$ 12,150
Total matching contribution by the Company for the period	$ 265,000,000	$ 262,000,000	$ 244,000,000
401(k) Catch Up Contribution
401(k) and Deferred Compensation Plan [Line Items]
Allowed employee contributions (up to)	75.00%