Income Taxes - Difference Between Income Taxes at Federal Statutory Rate and Provision for Income Taxes (Details)	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019	Jul. 28, 2018
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	27.00%
State taxes, net of federal tax benefit	3.50%	2.00%	0.60%
Foreign income at other than U.S. rates	(1.50%)	(4.50%)	(5.20%)
Tax credits	(0.90%)	(1.70%)	(2.50%)
Foreign-derived intangible income deduction	(2.60%)	(1.30%)	0.00%
Domestic manufacturing deduction	0.00%	0.00%	(0.50%)
Stock-based compensation	(0.10%)	(0.60%)	(0.10%)
Impact of the Tax Act	0.00%	6.10%	80.10%
Other, net	0.30%	(0.80%)	(0.20%)
Total	19.70%	20.20%	99.20%