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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2019 | Aug. 25, 2018 | Aug. 26, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. corporate income tax rate | 21.00% | 25.90% | 35.00%
Additional Excess tax benefits from stock option exercises compared to prior year | $ 46,000 | $ 31,300 | $ 31,200
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 8,800 | 131,500 |
Operating loss carryforwards expiration period description | fiscal 2020 through 2039 |  |
Tax Credit Carryforward Expiration Description | fiscal 2020 through 2029.​​​​​​​ |  |
Amount of unrecognized tax benefits that could be reduced over next twelve months | $ 1,400 |  |
Accrued for payment of interest and penalties associated with unrecognized tax benefits | 1,400 | 700 |
Unrecognized tax benefits, if recognized would reduce effective tax rate, amount | 16,800 | 13,500 |
Valuation allowances on deferred tax assets | 23,923 | 19,619 |
Deferred tax assets from net operating loss carryforwards | 29,900 | 30,900 |
Future taxable income | 226,300 | 219,100 |
Deferred tax assets for income tax credit carryforwards | $ 13,000 | 16,300 |
Expiration date of tax credit carryforwards start year | 2020 |  |
Expiration date of tax credit carryforwards end year | 2029 |  |
Expiration date of NOLs start year | 2020 |  |
Expiration date of NOLs end year | 2039 |  |
Tax cuts and jobs act of 2017, transition tax, provisional income tax expense | $ 25,800 |  |
Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Provisional Income Tax Expense Benefit |  | 157,300 |
Deferred tax assets operating loss carryforwards and tax credits | $ 11,900 | $ 10,300 |

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