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Income Taxes - Difference Between Income Taxes at Federal Statutory Rate and Provision for Income Taxes (Details)	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020	Jul. 27, 2019
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal tax benefit	2.70%	3.50%	2.00%
Foreign income at other than U.S. rates	1.50%	(1.50%)	(4.50%)
Tax credits	(1.40%)	(0.90%)	(1.70%)
Foreign-derived intangible income deduction	(4.20%)	(2.60%)	(1.30%)
Stock-based compensation	0.60%	(0.10%)	(0.60%)
Impact of the Tax Act	0.00%	0.00%	6.10%
Other, net	(0.10%)	0.30%	(0.80%)
Total	20.10%	19.70%	20.20%

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Effective Income Tax Rate Reconciliation, Deduction, Foreign Intangible Income

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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