Recent Accounting Pronouncements - Schedule of Impacts of New Accounting Pronouncements on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Nov. 24, 2018	Aug. 26, 2018	Aug. 25, 2018	Nov. 25, 2017	Aug. 26, 2017
Assets
Prepaid expenses and other current assets	$ 38,854	$ 32,688	$ 21,899
Total current assets	809,413	795,589	784,800
Other assets	74,048	72,664	30,259
Total assets	1,907,158	1,896,580	1,843,386
Liabilities and shareholders’ equity
Accrued and deferred income taxes	86,837	87,831	74,070
Total liabilities	367,660	392,180	378,419
Retained earnings	1,480,922	1,444,672	1,405,239
Total shareholders' equity	1,539,498	1,504,400	1,464,967	$ 1,485,608	$ 1,453,192
Total liabilities and shareholders’ equity	1,907,158	$ 1,896,580	1,843,386
Under Historical Guidance
Assets
Prepaid expenses and other current assets	28,065
Total current assets	798,624
Other assets	30,727
Total assets	1,853,048
Liabilities and shareholders’ equity
Accrued and deferred income taxes	72,836
Total liabilities	353,659
Retained earnings	1,440,813
Total shareholders' equity	1,499,389
Total liabilities and shareholders’ equity	1,853,048
Capitalization of Contract Costs and Impact of Adopting New Revenue Standard | Accounting Standards Update 2014-09
Assets
Prepaid expenses and other current assets	10,789		10,789
Total current assets	10,789		10,789
Other assets	43,321		42,405
Total assets	54,110		53,194
Liabilities and shareholders’ equity
Accrued and deferred income taxes	14,001		13,761
Total liabilities	14,001		13,761
Retained earnings	40,109		39,433
Total shareholders' equity	40,109		39,433
Total liabilities and shareholders’ equity	$ 54,110		$ 53,194