Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Organization, Basis of Presentation and Significant Accounting Policies Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 140,874	$ 211,179	$ 450,617
Total cash and cash equivalents and restricted cash	216,993	299,675	543,940	$ 272,273
Restricted cash included in other current assets
Cash and Cash Equivalents [Line Items]
Restricted cash	76,119	88,496	90,193
Other assets
Cash and Cash Equivalents [Line Items]
Restricted cash	$ 0	$ 0	$ 3,130