Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	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