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
		Nov. 30, 2021	Nov. 30, 2020
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	[1]	32,510	32,723
Dilutive effect of restricted stock units	[2],[3]	1,060
Weighted average diluted common shares outstanding		33,570	32,723

[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 common stock equivalents was excluded from the share calculation for the three months ended November 30, 2020 due to a net loss.