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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Aug. 29, 2020 | Aug. 31, 2019 | Aug. 25, 2018
Income Taxes |  |  |  |  |
U.S. corporate income tax rate | 21.00% | 35.00% | 21.00% | 21.00% | 25.90%
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) |  |  |  | $ 8,800 | $ 131,500
Tax Cuts And Jobs Act of 2017 incomplete accounting provisional income tax expense benefit |  |  |  |  | 157,300
Tax cuts and jobs act of 2017, transition tax, provisional income tax expense |  |  |  |  | 25,800
Additional excess tax benefits from stock option exercises compared to prior year |  |  | $ 20,900 | 46,000 | $ 31,300
Deferred tax assets from net operating loss carryforwards |  |  | 32,200 | 29,900 |
Future taxable income |  |  | $ 247,100 | 226,300 |
Expiration date of NOLs start year |  |  | 2021 |  |
Expiration date of NOLs end year |  |  | 2040 |  |
Deferred tax assets for income tax credit carryforwards |  |  | $ 9,200 | 13,000 |
Expiration date of tax credit carryforwards start year |  |  | 2021 |  |
Expiration date of tax credit carryforwards end year |  |  | 2037 |  |
Valuation allowances on deferred tax assets |  |  | $ 28,373 | 23,923 |
Unrecognized tax benefits, if recognized would reduce effective tax rate, amount |  |  | 18,900 | 16,800 |
Deferred tax assets operating loss carryforwards and tax credits |  |  | 10,500 | 11,900 |
Accrued for payment of interest and penalties associated with unrecognized tax benefits |  |  | 1,600 | $ 1,400 |
Amount of unrecognized tax benefits that could be reduced over next twelve months |  |  | $ 1,500 |  |

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