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		9 Months Ended
		May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	[1]	31,757	32,588	32,346	32,560
Dilutive effect of restricted stock units	[2]	992	1,073	998	1,066
Weighted average diluted common shares outstanding		33,571	33,661	33,344	33,626
2.875% Convertible senior notes, due 2024
Earnings Per Share Disclosure [Line Items]
Dilutive effect of convertible notes	[3]	822

[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 three months ended May 31, 2022 and nine months ended May 31, 2023 and 2022 as they were considered anti-dilutive under the “if converted” method as further discussed below.