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Income Taxes - Reconciliation of U.S. Statutory Income Tax Rate (Details)	12 Months Ended
	Aug. 29, 2020	Aug. 31, 2019	Aug. 25, 2018
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	21.00%	25.90%
State taxes, net of federal benefit	1.90%	2.90%	3.00%
Impact from Tax Act	0	0	0.026
Domestic production activities deduction	0.00%	0.00%	(2.20%)
Income tax credits	(2.50%)	(4.50%)	(0.50%)
Nondeductible compensation	0.90%	0.00%	0.00%
Tax-free and dividend income	(0.60%)	(0.50%)	(0.40%)
Uncertain tax position settlements and adjustments	0.10%	0.90%	0.10%
Other items	(0.30%)	(0.30%)	(0.30%)
Effective tax provision rate	20.50%	19.50%	28.20%

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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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 deduction for qualified production activity.

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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 nondeductible expenses.

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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 other adjustments.

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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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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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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 income (loss) exempt from income taxes.

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