Segment Reporting - Long lived assets by geography (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
International
Long-lived assets	$ 65,134	$ 79,846
srt_SegmentGeographicalDomain [Member]
Long-lived assets	5,186,449	5,375,598
United States
Long-lived assets	$ 5,121,315	$ 5,295,752

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

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