Recent Accounting Pronouncements - Schedule of Impacts of New Accounting Pronouncements on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Feb. 23, 2019	Nov. 24, 2018	Aug. 26, 2018	Aug. 25, 2018	Feb. 24, 2018	Nov. 25, 2017	Aug. 26, 2017
Assets
Prepaid expenses and other current assets	$ 35,195		$ 32,688	$ 21,899
Total current assets	849,096		795,589	784,800
Other assets	75,447		72,664	30,259
Total assets	1,954,106		1,896,580	1,843,386
Liabilities and shareholders' equity
Accrued and deferred income taxes	87,688		87,831	74,070
Total liabilities	373,316		392,180	378,419
Retained earnings	1,520,431		1,444,672	1,405,239
Total shareholders' equity	1,580,790	$ 1,539,498	1,504,400	1,464,967	$ 1,544,401	$ 1,485,608	$ 1,453,192
Total liabilities and shareholders' equity	1,954,106		$ 1,896,580	1,843,386
Accounting Standards Update 2014-09
Assets
Prepaid expenses and other current assets				10,789
Total current assets				10,789
Other assets				42,405
Total assets				53,194
Liabilities and shareholders' equity
Accrued and deferred income taxes				13,761
Total liabilities				13,761
Retained earnings				39,433
Total shareholders' equity				39,433
Total liabilities and shareholders' equity				$ 53,194
Under Historical Guidance
Assets
Prepaid expenses and other current assets	24,406
Total current assets	838,307
Other assets	30,817
Total assets	1,898,687
Liabilities and shareholders' equity
Accrued and deferred income taxes	73,360
Total liabilities	358,988
Retained earnings	1,479,340
Total shareholders' equity	1,539,699
Total liabilities and shareholders' equity	1,898,687
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
Total current assets	10,789
Other assets	44,630
Total assets	55,419
Liabilities and shareholders' equity
Accrued and deferred income taxes	14,328
Total liabilities	14,328
Retained earnings	41,091
Total shareholders' equity	41,091
Total liabilities and shareholders' equity	$ 55,419