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Income Taxes (Reconciliation of U.S. Statutory Income Tax Rate) (Details)	12 Months Ended
	Aug. 31, 2019	Aug. 25, 2018	Aug. 26, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	25.90%	35.00%
State taxes, net of federal benefit	2.90%	3.00%	2.80%
Impact from Tax Act	0	0.026	0
Domestic production activities deduction	(0.00%)	(2.20%)	(2.40%)
Income tax credits	(4.50%)	(0.50%)	(0.60%)
Tax-free and dividend income	(0.50%)	(0.40%)	(0.70%)
Uncertain tax position settlements and adjustments	0.90%	0.10%	(0.60%)
Other items	(0.30%)	(0.30%)	0.80%
Effective tax provision rate	19.50%	28.20%	34.30%

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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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