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, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding	[1]	32,588	32,573	32,560	32,726
Dilutive effect of restricted stock units	[2],[3]	1,073	1,032	1,066	1,021
Weighted average diluted common shares outstanding		33,661	33,605	33,626	33,747

[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 and nine months ended May 31, 2021 as the average stock price was less than the applicable conversion price and therefore was anti-dilutive under previous applicable guidance. See further discussion below.