Income Taxes - Difference Between Income Taxes at Federal Statutory Rate and Provision for Income Taxes (Details)	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory rate	21.00%	27.00%	35.00%
State taxes, net of federal tax benefit	2.00%	0.60%	1.10%
Foreign income at other than U.S. rates	(4.50%)	(5.20%)	(13.40%)
Tax credits	(1.70%)	(2.50%)	(1.20%)
Foreign-derived intangible income deduction	(1.30%)	(0.00%)	(0.00%)
Domestic manufacturing deduction	(0.00%)	(0.50%)	(0.40%)
Stock-based compensation	(0.60%)	(0.10%)	1.40%
Impact of the Tax Act	6.10%	80.10%	0.00%
Other, net	(0.80%)	(0.20%)	(0.70%)
Total	20.20%	99.20%	21.80%