Earnings (Loss) Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Earnings (Loss) Per Common Share (Detail) - shares shares in Thousands		3 Months Ended		6 Months Ended
		Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	[1]	32,582	32,810	32,546	32,766
Dilutive effect of restricted stock units	[2],[3]	1,066		1,063
Weighted average diluted common shares outstanding		34,463	32,810	33,609	32,766
2.875% Convertible senior notes, due 2024
Earnings Per Share Disclosure [Line Items]
Dilutive effect of convertible notes	[3],[4]	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)

[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 common stock equivalents was excluded from the share calculation for the three and six months ended February 28, 2021 due to a net loss.(3)

[4] The dilutive effect of the 2.875% Convertible notes due 2024 was excluded for the six months ended February 28, 2022 as they were considered anti-dilutive under the “if converted” method as further discussed below.(4)