Segment Reporting - Revenues and Income Before Income Taxes by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 29, 2020	May 30, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 25, 2019	Feb. 23, 2019	Nov. 24, 2018	Aug. 29, 2020	Aug. 31, 2019	Aug. 25, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 428,643	$ 445,518	$ 464,600	$ 465,398	$ 479,621	$ 453,720	$ 437,485	$ 438,550	$ 1,804,159	$ 1,809,376	$ 1,696,489
Income before income taxes									177,888	237,924	187,246
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									1,659,913	1,683,321	1,559,780
Income before income taxes									175,301	236,843	184,605
Europe, Canada, Mexico and Nicaragua
Revenues From External Customers And Long Lived Assets [Line Items]
Income before income taxes									2,587	1,081	2,641
Europe and Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues									$ 144,246	$ 126,055	$ 136,709