Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Earnings Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Earnings Per Common Share (Parenthetical) (Detail) - shares	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019	Apr. 30, 2021
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Anti-dilutive shares excluded from calculation	0	0	0
2.875% Convertible senior notes, due 2024
Earnings Per Share Disclosure [Line Items]
Debt instrument, interest rate	2.875%	2.875%	2.875%
2.875% Convertible senior notes, due 2028
Earnings Per Share Disclosure [Line Items]
Debt instrument, interest rate	2.875%			2.875%
2.25% Convertible senior notes, due 2024
Earnings Per Share Disclosure [Line Items]
Debt instrument, interest rate	2.25%	2.25%	2.25%