Earnings Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares shares in Thousands		3 Months Ended		6 Months Ended
		Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	[1]	32,588	32,582	32,654	32,546
Dilutive effect of restricted stock units	[2]	991	1,066	1,000	1,063
Weighted average diluted common shares outstanding		34,400	34,463	33,654	33,609
2.875% Convertible senior notes, due 2024
Earnings Per Share Disclosure [Line Items]
Dilutive effect of convertible notes	[3]	821	815

[1] Restricted stock grants and restricted stock units that are considered participating securities, including some grants subject to certain performance criteria, are included in weighted average basic common shares outstanding when the Company is in a net earnings position.

[2] Restricted stock units that are not considered participating securities and restricted stock units subject to performance criteria, for which actual levels of performance above target have been achieved, are included in weighted average diluted common shares outstanding when the Company is in a net earnings position.

[3] The dilutive effect of the 2.875% Convertible notes due 2024 was excluded for the six months ended February 28, 2023 and 2022 as they were considered anti-dilutive under the “if converted” method as further discussed below.