Income Taxes (Reconciliation of U.S. Statutory Income Tax Rate) (Details)	12 Months Ended
Aug. 27, 2016	Aug. 29, 2015	Aug. 30, 2014
Income Tax Disclosure [Abstract]
US federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	2.50%	2.40%	2.30%
Tax-free and dividend income	(1.30%)	(1.30%)	(1.50%)
Income tax credits	(1.10%)	(0.30%)	(0.40%)
Domestic production activities deduction	(2.50%)	(3.70%)	(2.80%)
Other permanent items	(1.30%)	(0.80%)	(0.90%)
Valuation allowance	0.00%	0.00%	(0.40%)
Uncertain tax positions settlements and adjustments	0.00%	(0.50%)	(1.00%)
Effective tax provision rate	31.30%	30.80%	30.30%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
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-Subparagraph (SX 210.4-08.(h)(2))
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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 valuation allowance for deferred tax assets.

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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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to other permanent items.

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