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Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate To Effective Tax Rate) (Details) | 12 Months Ended
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Aug. 29, 2020 | Aug. 31, 2019 | Sep. 01, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |  |
U.S. Federal statutory rate | 21.00% | 21.00% | 25.60% | 35.00%
State income taxes, net of Federal benefit | 3.70% | 3.70% | 3.40% |
Revaluation of Net Deferred Tax Liabilities |  |  | (10.00%) |
Other, net |  | (0.10%) | (0.10%) |
Effective income tax rate | 24.70% | 24.60% | 18.90% |

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