Organization, Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2020	Sep. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassifications
Operating Lease, Right-of-Use Asset		$ 257,834	$ 268,400
ASC842cumulativeeffectadjustment			25,300
Other liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability			267,000
Other assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset			$ 268,400