Income Taxes (Difference Between Income Taxes at Federal Statutory Rate and Provision for Income Taxes) (Details)	12 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 30, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	27.00%	35.00%	35.00%
State taxes, net of federal tax benefit	0.60%	1.10%	0.50%
Foreign income at other than U.S. rates	(5.20%)	(13.40%)	(14.50%)
Tax credits	(2.50%)	(1.20%)	(1.70%)
Domestic manufacturing deduction	(0.50%)	(0.40%)	(0.60%)
Stock-based compensation	(0.10%)	1.40%	1.40%
Tax audit settlement	(0.00%)	(0.00%)	(2.80%)
Impact of the Tax Act	80.10%	0.00%	0.00%
Other, net	(0.20%)	(0.70%)	(0.40%)
Total	99.20%	21.80%	16.90%